Added maneuver node stats

Added documentation for maneuver node stats, based on code contributed by Ehren Murdick.
Fix for save-killing bug
Merge branch 'master' of https://github.com/Nivekk/KOS
Better handling of missing textures
Fixing case on texture paths
Experimental non-qwerty support
Adding a changelog
Merge branch 'master' of https://github.com/Nivekk/KOS
Resource tags now functional
Support for limited sub-expressions within R() expressions
Commented out an old file
Update README.md

Corrected ETA:NODE expression
Update TermWindow.cs

Fix for issue #14