rainglow

data driving for rainglow modes

• modes are loaded from json through a server datapack
• when joining a server that has modes unknown to the client, they will be sent over
• modes define a text colour, an id, and a list of colours

config sync

• config sync can be toggled on and off through config
• when enabled, the client will send its config to the server on join
• the client cannot edit their config while in a server, either through the file or the screen
• this mode can be default, custom-defined through json, or even the builtin "custom" mode
• the client's config is reset when leaving the server

improvements to config parser