[TODO] Reimplement //rotate and //flip

[inxomnyaa]

Description: Due to extracting blockstates into a virion (see #236), the rotate and flip method had to be removed to loosen up the dependency on MWE2.

I have already added API::rotate() in this branch: flip-rotate. As of now it only supports changing the block positions, not the states though.

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TODO list:

• [ ] Implement blockstate modifications
• [ ] Implement flip
• [ ] Correct counterclockwise => clockwise
• [ ] Update rotation and flip data json
• [ ] Implement rotating around origin/center
• [ ] Correct pasting in new chunks not working
• [ ] Allow -90 as rotation degrees parameter as synonym for 270
• [ ] Fix Rotate- & FlipAction not updating progress / calculating changed count
• [ ] Remove unnecessary try-catch blocks
• [ ] Allow rotating .mcstructure files