Multipart fixes

[Trinsdar]

Fixed a couple issues I found with multipart blocks, still need to figure out why not all multipart blocks want to render
Also made Gates able to be multiparts, though I haven't made any of them use the multipart item yet because of #636. #636 will probably also conflict with this, so should probably merge this first

[MoreThanHidden]

Thanks for the PRs hopefully I'll have some time to review this afternoon.

[MoreThanHidden]

Seems the gates aren't rendering and blulectric cables don't seem to talk multipart to multipart I haven't had a chance to look into this yet.

[Trinsdar]

Yah i noticed that same issue with the gates, the only thing I found so far when trying to debug it was maybe it's the render type? I tried setting the gates to use the translucent render type but that made them render weird when not in a multipart, and it didn't seem to fix the issue. All I know for sure is for some reason it's not adding the quads