Implement level.dat reading and load the seed for use in world generation #1463

Job	Run time
Run lints in release mode (stable)	49s
Build project and test (ubuntu-latest, stable)	6m 6s
Build project in release (ubuntu-latest, stable)	1m 38s
Build project and test (windows-latest, stable)	13m 22s
Run lints (stable)	1m 4s
Build project in release (windows-latest, stable)	4m 27s
Build project and test (macos-latest, stable)	4m 39s
Check formatting (stable)	9s
Build project in release (macos-latest, stable)	1m 43s
	33m 57s

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