Modern Beta for Forge 1.12.2

• Add support for remapping world customization navigation keybinds (default: A/D).
• Remove non-Beta biome check for Beta/PE color sampling.
• Update various GUI elements.
• Fix various GUI typos and issues.

Technical Changes

• Add new ScreenProperty custom property. This is a client-side property that can be registered to the ModernBetaClientRegistries.GUI_PROPERTY registry to allow creation of custom screens for the Modern Beta world customization screen.
• Add localization for ListProperty properties.
• Update NoiseSurfaceBuilder; beach block selector methods are now public and have been renamed.
• Update constructor for chunk sources to now also accept the chunk generator's BiomeSource to avoid needless duplication since some chunk sources require the biome source for terrain generation.
• Update how certain custom property elements are localized.
• Rename ClimateMap and ClimateType to BetaClimateMap and BetaClimateType, respectively.