Server Specific Skins

This release is for Minecraft 1.20.1.

Features:

• Skins are now stored for unique server-address server-name pairs - have multiple listings and pick between the skins you want for the same server!
• Some behind-the-scenes updates to configuration systems, which may make them a little harder to interact with (sorry!)

Bugs fixed:

#1 - Fixed a crash which occurs if adding a server without having set a skin before due to lack of config file creation