Consolidate networking stuff into network.gd

[TheSecondReal0]

Right now connection handling is split between main.gd and network.gd, when ideally it should all be in network.gd. This includes names, version checking, etc..

[vainiovano]

Should players' names (and colors) be in network.gd or in player.gd? Each player has a name and color, and they need to be used for rendering.

[TheSecondReal0]

I think names should be stored in network.gd just so that they're accessible from anywhere, same with colors. Probably in dictionaries where names and colors are stored according to player IDs.

[monban]

As per @TheSecondReal0, this issue should not be closed yet.