Original texture by tobyplowy, colourised by paramat.

This adds def, def.radius and def.damage_radius defaults to the
tnt.boom() function if they aren't specified on call.

Clarify README.txt.

In survival mode, use of the minimap requires the mapping kit item.
Minimap radar mode is always disabled in survival mode.

Minimap and minimap radar mode will be automatically enabled in creative mode
and for any player with the 'creative' privilege.

The 'map.update_hud_flags()' function is global so can be redefined by a mod for
alternative behaviour.

Based on code by github user 'hdak1945git'.
Fixes a crash when 'colorfacedir' param2 is used for beds.

Check for on_rightclick functions of nodes when holding a waterlily.

Make deeper, to compensate for ease of travel using 3D noise tunnels.
Make depth more progressive with value:

Ore, upper limit

Coal 64 no change
Iron 0 no change
Tin -32 > -64
Copper -16 > -128
Gold -64 > -256
Diamond -128 > -512
Mese crystal -64 > -512
Mese block -1024 no change

Make y of 1st density increase deeper but following a similar logic to before:

Ore, upper limit

Coal 0 no change
Iron -64 no change
Tin -128 no change
Copper -64 > -256
Gold -256 > -1024
Diamond -256 > -1024
Mese crystal -256 > -1024
Mese block -2048 new

Add second, denser layer of mese blocks with a decrease of separation and
increase in density equal to mese ore layers.

Fixes #1885

This should fix the chest staying open when a player disconnects while inside.

Forgot this in the last commit, thanks @Fixer-007

Add 'explode_centre' flag which when false explodes as normal and when true runs on_blast on centre node as well as dropping items.

Move mushroom spread ABM action into a global and overridable function.
Optimise spread code.
Reduce spread range to reduce spread through walls.

Remove string -> cotton alias.

The tnt:boom node doesn't actually need the on_construct and on_timer functions to remove the node after 0.4 seconds as the tnt_explode function already does this beforehand.

Furnace inactive (Item: Not cookable; Fuel:
Empty)

--> becomes -->

Furnace inactive
(Item: Not cookable; Fuel: Empty)

Split some long lines.
Some nearby code cleanup.

Liquids that are 'igniters', such as lava, will drop the torch without
a flame-extinguish sound, as the torch item will burn up after a few
seconds with a sound and smoke particles.

All other liquids cause a flame-extinguish sound.

Make the placeholder biomes grassland to make the shape of the floatland
terrain more visible.

An excessive load has been reported caused by the node searching, so even
when no lava is present.

Minor fix to reduce cart jitter slightly

Resize default_clay_brick.png from 16x17px to 16x16px, as mentioned in issue #1855

This is the maximum level of the other diamond tools and makes the
number of uses similar to them.