This commit includes a a few more changes because I'm too lazy to
clean them up:
- fix chunk modification times
- improve command line arguments
- load multiple chunks at once
This is a first try at connecting multiple clients using a server.
The commit includes a lot of debugging messages.
I will hopefully clean up the server and some of the client code.
Todo:
- make ChunkDiffs contain deletions
- inserting a " " counts as deletion on chunk level
- allow for more unicode characters! ^^ (only harmless ones though - no newline or control characters etc.)
