Slabs are placed horizontal instead of vertical, even if they are
placed on a wall.
Slabs are rotated automatically if they are placed to another slab,
no matter which material.
Slabs are placed at the lower position if the placer points into
the lower half of the pointed node and to the upper position if
pointed to the upper half.
Stairs are placed normal if the placer points to the lower half of
the pointed node and rotated upside down if pointed to the upper half.

This also allows custom actions (such as using the screwdriver as a wrench).

As part of making vertical travel easier to reduce reliance on
sneak ladders.
Calculate using cubic pixels of steel.

A steelblock is 16^3 = 4096 cubic pixels steel.
6 ingots is 6/9 steelblocks.
A rail is a 2*2*16 pixel length of steel, 64 cubic pixels steel.
6 ingots produces 2*21 rails = 21 rail nodes.
Choose 18 for an even number that is a multiple of ingot number.

Replace the stick with 2 wood in the recipe to be closer to the amount
of wood that would be needed for 20*4 sleepers.

Replace 2 mese crystal fragments with 1 mese crystal to
compensate for the larger number of nodes returned. The result
is the recipe is much more generous with steel usage but slightly
less generous with mese usage, keeping power rail cost reasonably high.

Replace 2 coal lumps with 1 for a similar recipe to power rails.

Fixes bug caused by b847888c

Flora is converted to dry shrub in desert sand and silver sand.
No conversion in sand to preserve sand dune grasses.
Dry shrubs do not spread so this conversion, used by players, is the
only way to generate them.

Replace possibly trademarked artwork with royalty free and
OK for commercial use artwork.

The Pup appears by default but does not alias the Nyan Cat nodes
away. For that you will have to enable the setting. A settingtypes.txt
is provided to make that really easy. This allows people to get
an out-of-tree mod and not have their Nyan nodes disappear.

The mod can also be disabled entirely this way for those who don't
want it.

There's some eatser eggs in here as well. Instead of making the
nodes burnable, they are edible, and make you bark and howl. And
perhaps something else too.

If there is no group:soil node found below, do not replace flora with
dry shrub, this was breaking flower pots and other mods.
Originally, flora would only turn to dry shrub if in desert sand.

Use the soil group more instead of checking for multiple node names.
Remove 'neighbors' from ABM.
Turn any flora to dry shrub if on a non-soil, except when on default:sand
to avoid dune grasses being replaced.
Search for "group:soil" when searching for a position for the new flora
node, instead of searching for multiple node names, however do not spread
flora onto desert sand, which is in the soil group.

Remove default:dirt_with_snow from the soil group as it would be frozen
soil. It can be dug and placed to turn it into dirt (consider this some
extra work needed to make it cultivatable).

Commit c68b8274 prevented books from
being copied in the crafting grid, and made it so that old books, though
seemingly successfully transferred to the new format, could not be written
to as the old data still persisted.

- Allow rotation of wallmounted nodeboxes (signs) since they are
  now rotating properly.
- Instead of testing `ndef` several times, do it once, correctly.
- Simplify exception logic for nodes that have `on_rotate` set.
- For simplicity, return itemstack, always.
- Remove a useless nil check.

Some code was lost during a rebase of a recently merged commit (73e4666f).

Although the new aspen tree schematic only requires a radius of 2 the
many existing aspen trees in a world require radius 3.

Previously you could place junglegrass on dirt to convert that dirt to
dirt_with_grass, but this is unsuitable now that rainforest has a
surface of dirt_with_rainforest_litter.
Remove junglegrass from the 'grass' group.

Since meta secret field is blank on any keys (default:key) obtained using
/give, the game will crash if you attempt to use one of these. This follows
along the principle that the game should never have any reason to crash.

A simple set of biomes for now: Ocean, coniferous forest, grassland,
sandstone desert.
Update biome lists for blob ores and decorations.

Make sandstone desert filler 1 node deeper to match other deserts.

Instead of right click, the skeleton key is now a true `tool`
in the sense that it's default left-click action is to create
a key for the locked object.

This is far better than the outcome of the patches we've done
where the only way to create a key for a locked item was to
use sneak+rightclick. Now keys are perhaps a bit more sensible,
left for making keys, right for opening stuff with keys.

Fixes #1625

Migrates settings safely and evacuates the `homes` file
entirely over time.

Update readme.txt with new TNT crafting recipe.

Without this patch, any fire created(placed) by tnt explosions
will remain forever on the map.

Completes a forgotten update in 9d3a5263

This should be fairly cheap and pops off items if needed.

The table was generated using the old code. A table lookup
should be faster than lots of math and branches.

Allows us to drop `nextrange()` as well.

Allows rotating things like signs and torches. Axis rotation
rotates over all 6 faces, face rotation flips upside down to
flat on floor only, and of course in the 4 horizontal directions.

Made the code a bit more modular to account for different rotation
schemes. Should be easier to extend from here on to other needs,
and the functions can be reused by other mods for convenience.

Usage and tool break sounds were played at 'pointed_thing.above' which
can be nil if not pointing at anything or at an entity. This caused
sounds to be played to all players on a server non-positionally.

Fallback to player pos for sounds if 'pointed_thing.above' is nil.

Replace 'pt' variable with 'pointed_thing' in 'register_tool'.

Currently jungletrees and junglegrass use sidelen 80 for simplicity,
but this results in a more uneven distribution of decorations. A more
even distribution helps keep rainforest darker with a more unbroken
canopy.
This is also more consistent. 80 is based on the default mapchunk
size, all other decorations use sidelen 16 or smaller to divide into
any mapchunk size.

Denser jungletree for darker rainforest:
Highest 'jungletree' nodes now prob 255.
Add a 5th lower branch layer.
Increase lower branch layer y-slice prob to 191.

Aspen:
Extend trunk upwards by 1 node to reduce leafdecay radius to 2.

Pine:
Make lower trunk 1 node longer so that lowest branches are more often
higher off the ground, also to make pines taller.

Appletree:
Make 2 opposite branches prob 255, the other 2 prob 127, to avoid
trees with 1 or 0 branches. Therefore also add random rotation.