Implement level.dat reading and load the seed for use in world generation #1456

Job	Run time
Run lints in release mode (stable)	1m 12s
Run lints (stable)	2m 16s
Build project and test (ubuntu-latest, stable)	8m 38s
Build project in release (ubuntu-latest, stable)	2m 37s
Build project and test (windows-latest, stable)	11m 6s
Build project in release (windows-latest, stable)	5m 0s
Check formatting (stable)	19s
Build project and test (macos-latest, stable)	6m 47s
Build project in release (macos-latest, stable)	2m 22s
	40m 17s

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