Fix for Schematic flip_x/y/z commands (#2353)
* Fix for schematic flip_x/y/z command to fix origin off by one, and properly handle flipping block/entity data as needed
* Cleanup import statement to match other imports
Cleanup unnecessary return on flipX
* Added missing case for flipping face of straight stair blocks
* Cleanup formatting
* Rework FlipEntitiesX/Z into single method
Fix FlipEntities referencing new EntityTag
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commit: 050403f)
