21.0.33+fabric-1.21.1

Removed outdated keymapping mixins as they never worked well and resulted in Balm being loaded too early with Essential
- Shouldn't have any effect on Balm mods since all that depended on this already migrated to Kuma

Added BalmRegistries.register(...) to allow registering objects into any registry
Added BalmParticles to allow registering particles
Added BalmRenderers.registerParticleProvider(...) to allow registering particle renderer providers
Added Balm.platformProxy().withForge(...).withFabric(...).build() as a simple alternative to SPI for platform-specific implementations
Added Balm.modProxy().with(modId, className).withMultiplexer(...).withFallback(...) for abstracting away mod compat under common interfaces
Added BalmPermissions with support for Neo/Forge PermissionAPI and fabric-permissions-api
Added balm.command.balm.dev, balm.command.balm.export.config, balm.command.balm.export.icons permission nodes
Added crash when active config is unexpectedly set to null to avoid confusing errors later on
Fixed OnLoadHandler not working on block entities in Fabric
Fixed in-memory config potentially being reset to default on Forge instead of using data from config load event
Fixed PoiTypes not registering properly on Fabric
Fixed Kuma version pinning to avoid shipping snapshots
Changed balm export commands to require op
Changed mod id on Fabric to "balm" ("balm-fabric" is still provided for backwards compatibility)
Deprecated most getters in BalmRegistries since Vanilla equivalents can be used nowadays