remove some unused code

[andreasweishaupt]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 11666810829

Details

• 8 of 8 (100.0%) changed or added relevant lines in 3 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.04%) to 94.229%

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Files with Coverage Reduction	New Missed Lines	%
BusinessLogic/Commands/CommandStateManager.cs	1	95.0%

Totals
Change from base Build 11591918164:	-0.04%
Covered Lines:	17227
Relevant Lines:	18282

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💛 - Coveralls

[andreasweishaupt]

• Remove drag learning element
• Remove load learning element and learning space (they can no longer be saved separately)
• Remove Load learning world from stream on most occasions. Version compatibility test uses it in one place
• Remove file extensions for learning element and learning space