Previously, cloud density was too low at medium humidity.
Tune cloud density variation to match the default/classic value at
humidity midvalue 50.
Tune the lower limit of cloud density that occurs at extreme low
humidity.
Increase minimum cloud thickness to 2 nodes.
Add comments.

The player should always be teleported away when they die and
we can still fall back to the engine spawning code.

This is not directly related to player models but fits well
as a convenience feature in player_api.

Skips redundant calls to creative.update_creative_inventory and fixes the 'Reset' button which double-refreshed the filter cache.

To visually match the 1 node per second spread of flowing water.

Papyrus was missing from the dry dirt 'savanna_shore' biome due to
only being placed on dirt. A mistake made when changing savanna
dirt to dry dirt.

Rename existing papyrus schematic to 'papyrus_on_dirt' and only
place in the 'rainforest_swamp' biome.
Add a new papyrus schematic 'papyrus_on_dry_dirt', placed in the
'savanna' biome.

rail = 轨道 / 栏杆
grass = 草

and, mese color is yellow, so i translate it to "黄石"。（Chinese words without MESE）

This allows mods to easily implement the same behaviour, e.g. for letters.

In preparation for a new Mapgen V7 floatland implementation.