Small changes and hotfixes for v. 0.21 release:

Fixed discovered map data not saving and loading correctly.
Upgraded LWJGL framework, this should fix the issue with newer Macs not being supported.
Fixed crash when trying to set a control key while having selected an invisible header.
Fixed possible crash when another player enters a chat message while loading.
Fixed save files not loading when having used characters not supported by UTF encoding.
Fixed player texts being cut short in saves when using double forward slash.
Fixed outdated library causing issues on newer Macs.