Bump to 1.21.8, still works on 1.21.6/7

Fix broken conversion of entity types, improve resource pack generati…

…on reliability on client on windows, give more control over remapping block entity types, rework PolymerMapCodec, add pick block support to InteractionHandler

Fix crossbows item transforms, reserve empty models for global usage,…

… fix IdentifiedUniqueEntityAttachment, very simple client config screen

Fix ConditionItemModel#replaceChildren

Add support for custom ConsumeEffects, update jar to use 1.21.7-rc2 (…

…it should work with polymer just fine), fix bunch of issues

Fix global palette bit count not being used to calculate packet size …

…(vanilla validates it now), move /polymer stats to dialogs, font asset support in extras

Fix ItemModel interface init breaking if class loading order changes

Update to mainline 1.21.6

Update to pre.2, update jar, add dialog based resource pack generatio…

…n status info

Bump version