Fix rotation + flipping for GT textures

[RecursivePineapple]

When you flip + rotate an AL, its texture doesn't match its orientation. From what I can tell, this is because structurelib and RenderBlocks rotate & flip in different orders. To fix this, I copied the face rendering code from RenderBlocks and cleaned it up significantly then modified it as needed.

While I'm sure there's a simpler/lower code way to do this, I didn't want to deal with RenderBlocks' quirks if I didn't have to. From what I can see, RenderBlocks' only benefit is AO, but I copied all of that code here. This change won't affect the angelica animation system because of this PR: GTNewHorizons/Angelica#868

This change adds a few more allocations to the ISBRH render, but I figure it's worth it to keep it simple. Pooling would reduce the allocs, but I don't want to do that unless there's a clear performance hit.

Testing done:

• Make sure AL's texture is correct in all six facings (top & bottom have up = negative z, which is what it was previously)
• Check each facing's 4 rotations to make sure they match the structure (AL's white control panel thingy should point to its main body)
• Do the same, but with the AL flipped
• Disable useExtFacing and check the six facings again to make sure the facings match the unrotated & unflipped ExtendedFacing
• Check maintenance hatches (since they can be rotated but not flipped)
• Check normal gt singleblocks with multiple textures (biolab in this case since it has a top texture) to make sure they work the same

[leagris]

Please do not replace the standard renderer with your own implementation that merely duplicates existing code. Even if it does not cause issues now, it will create problems later. For example, if someone patches the renderer to leverage rendering improvements, that patch will not apply to your duplicated implementation.

The standard renderer already handles all texture rotations and flips. I see no valid reason for a custom implementation that directly interacts with the tessellator.

[leagris]

Looks much better. Thank you for this nice contribution.