[invader-compress] Properly deprecate zstd method, suggest alt. to users

[BinToss]

Attempts to compress a map with zstd should throw an Exception with a message explaining that doing so is no longer supported—suggest an alternative compression method if available.
Attempts to decompress a map that was compressed with zstd should also throw an exception. This time, suggest the standalone CLI tool proposed in SnowyMouse/chimera#83

[Aerocatia]

invader-compress was removed completely as there are no halo maps that can be both compressed and uncompressed. Xbox maps must be compressed to be valid.