Add (optional) confirmation dialog on exit
Fix #179 (Crash on exit)
Use inverse scale for UDMF floor/wall scale properties

Fixes #177
Center the texture editor patch browser by default
Correct invalid lines created via line drawing anti-clockwise

Fixes #181
Uncheck textures from base resource by default in 'Remove Unused Textures' function

Close #174
Flip line if second side sector is set with no first side on create sector (#181)
Add SLADE 2 colour configuration
Rename default.txt to Default.txt
Bump version to 3.1.0.1
Merge branch 'master' of https://github.com/sirjuddington/SLADE into osx