Customized biomes (#396)

* Start with customized biome UI

* Refactor customized page, split logic

* Implement biome replacements

* Remove debug messages

* Disable create button when nothing is modified

src/app/components/customized/CustomizedModel.ts

@@ -22,7 +22,9 @@ export interface CustomizedModel {
 	noiseCaves: boolean,
 	carverCaves: boolean,
 	ravines: boolean,
+	// Biomes
 	biomeSize: number,
+	biomeReplacements: Record<string, string>,
 	// Structures
 	ancientCities: boolean,
 	buriedTreasures: boolean,
@@ -85,7 +87,9 @@ export namespace CustomizedModel {
 			noiseCaves: true,
 			carverCaves: true,
 			ravines: true,
+
 			biomeSize: 4,
+			biomeReplacements: {},
 
 			ancientCities: true,
 			buriedTreasures: true,