Corrected IsBlockAttachable() in BlockVine.h
Corrected drops from dead bush, tall grass and cobweb.
Leaves are harvest-able.
Merge branch 'master' into BlockFixes
Moved tall grass pickups handle.
Reverted hook move.
Exported individual projectile classes to Lua API.

They used to be exported, but then they were moved to separate files and those werent' added to the ToLua processing list.
Fixed trailing whitespace.
Properly exported cItemFrame and cHangingEntity to Lua.
Merge pull request #1515 from mc-server/BlockFixes

Block fixes
cItemFrame: Fixed a forgotten rename.
Added inheritance information to Lua docs for projectiles.
Clearer version indication.
APIDump: Added docs for a few projectiles.
LuaState: Projectiles are pushed using their full class.
Upgraded core.
ComposableGenerator: Removed nullptr initializers.
En masse NULL -> nullptr replace
Merge pull request #1559 from mc-server/nullptr

En masse NULL -> nullptr replace
Signs can be placed on wallsigns.

Fixes #1438