Play/Server Logic (Make server joinable)

[Iapetus-11]

What do?

• Start on packet handlers for play packets, world saving + loading code, etc...
• For packet handlers, you should go roughly "in order", basically do the ones most integral to being able to play on the server first.

See here for a normal login sequence: https://wiki.vg/Protocol_FAQ#What.27s_the_normal_login_sequence_for_a_client.3F

[Iapetus-11]

• Currently working on storing chunks in memory in an efficient way which allows them to be put into both a chunk packet and region file efficiently and quickly

[Iapetus-11]

• Currently working on sending light update packets properly, once that is done I will close this issue and merge to main!