Small compatibility changes

[JadedBanana]

Hello! I've been working with PolyMc with Skerit for about 2 and a half months now and here implemented two changes I find necessary.

The first is a change with the GSON item & block model reader to make the rotation and tintindex tags optional and thus not put into every file. I found this necessary as I was having troubles implementing DyeableItems that had only some parts of it dyeable (the tintindex: 0 tags everywhere made the whole thing colored regardless of what I fed into it).

The second change is one I found necessary because I was making an item that had an override to BlockItem.getTranslationKey and the Heart of the Sea item was having its rarity poke through and make the name yellow. I found it simpler to just swap it out with a different item rather than chase down the cause of that bug.

[JadedBanana]

Since creating this pull request, I've added two fixes:

I removed the Count attribute being sent in clientItems' PolyMcOriginal tag, since that was preventing clean item stacking while being wholly redundant as it's overwritten by the actual item count anyways.

Secondly, I added a priority list to model override sorting during resource pack creation. I encountered a problem while making a second custom compass where the second compass' item was completely static and ignored rotation. I found that this was because the override sorting was considering the angle of 0.953125 being below the custom_model_data of 2.0, and thus putting the base override without the angle at the very end, nullifying the other overrides. This change I added makes the sorting algorithm consider the custom_model_data FIRST, then sort by everything else.

[TheEpicBlock]

Sorry for taking this long to respond, the changes look good! Thank you :D