Since the unflattening in 1.13.x, block IDs are no longer stable across versions, and
can be shifted by the addition of new block states. To get the right block IDs across
multiple protocol versions, add a new `offsets` token to `define_blocks!`, which
is similar to `offset` (used post-flattening, compare to `data` used pre-flattening),
but accepts a protocol_version argument to enable block states _per-version_:
* Add 'offsets' for protocol_version-specific blockstates
As part of this change, by_vanilla_id is now a method of a VanillaIDMap instance,
instead of a method of Block, so it can know the protocol version. Previously, the
ID map was lazily computed statically, once, but this change allows it to be
computed based on protocol version:
* Move by_vanilla_id to VanillaIDMap instance
Tools to help debug blocks:
* Add DEBUG_BLOCKS environment variable to dump block states
* Add dump_block command-line tool
The block `offset`s were previously only correct for 1.13.2, to take advantage of
the new version-specific `offsets` capability, blocks were updated for 1.14.x:
1.14+ (protocol_version >= 477):
* Add NoteBlock instruments
* Add FlowerPot and RedFlowerVariant cornflower, wither rose, lily of the valley
* Add StandingSign wood variants
* Add WallSign tree variants
* Add StoneSlab smooth stone, cut sandstone, cut red sandstone
This fixes#467, where grass was misinterpreted as fire on 1.14+ because of the
ID shifts caused by NoteBlock, among other block misassignments (though not 100%).
8ca12a69ce