Blockstate/Model Json Support

[Exidex]

Some time ago I was playing around with forge and blockstates and I've got some ideas to make it more convenient to create/edit json files.

• [ ] Ctrl + Left Click on path to go to the model/blockstate json file

• [ ] Same as above but for images

• [ ] Validate whether model/blockstate json file has proper structure

• [ ] Validate whether vanilla style variant has properties placed in alphabetical order

• [ ] If blockstate json has a default variant, has not all textures (ones with #) from default variant set and some variant overrides default model (with all textures from model that overrides default one set), show a warning to set textures on default model to prevent "Unable to resolve texture due to upward reference" warning

[marvin-roesch]

The proper JSON structure could be enforced with IDEA's built-in JSON Schema support, I might get a PR ready for that.

[liach]

@DemonWav Can you just add the control left-click part first? I understand that validation of files may be harder, but the left-click redirection should be relatively simple to implement.

[sylv256]

Still no BlockState schema support?