@xmcl/resourcepack - New features (including a "minor" breaking change)

[John-Dean]

I've done this as 3 independent commits which, in chronological order, do the following:

Commit 1:

Restructured resourcePack.ts's ResourceLocation class to have more outputs as follows:

• Addition of ofItemModelPath and ofBlockStatePath functions that were missing
• Change to all of... functions to use a standardized function (deconstruct) instead of repeated code
• Change to all of... functions inputs to both accept string and ResourceLocation types (Non-breaking change)

Commit 2:

Reworked modelLoader.ts's new ModelLoader().loadModel to:

• Additional argument: folder
  • defaults to blocks to make this a non-breaking change (mimics existing functionality)
  • allows you to instead use items for item models (for example shown in item frames)
• Change to variable names to be clearer (parentModel and baseModel)

Commit 3:

• ❗[Breaking change] Rework to the cache (.models) to instead use resourceLocation.toString() (instead of modelPath)
  • This makes more sense, as different modelPath inputs could resolve to the same model, but resourceLocation.toString() is unique
  • I can find no references to the cache within the code, so this shouldn't break anything within the library
  • Moved the point where items are added to the cache to after the textures are loaded to prevent any potential issues
• Where a .models cache item is present it is now returned instead of re-loading the resource