Update CmakeLists.txt for wx 3.0 and webview
Fix for linux compilation
Implemented texture/flat usage count tracking
- Added option to sort by usage count to map texture browser
- Last selected map texture sorting type will be remembered between sessions
Merge branch 'master' of https://github.com/sirjuddington/SLADE.git
Entry autosave works again
MapSector now keeps track of the last time its geometry was updated
3d mode things now correctly update when the sector they are in is moved away
Some fixes for the TEXTURES editor:
- Update texture display when scale or offset is changed
- Fixed some display/selection problems when 'Apply Scale' is ticked
CTextureCanvas tex_scale was uninitialised, sometimes causing scale to apply even though 'Apply Scale' was not ticked
Init volume in audio panel.

Otherwise, the volume slider had to be "touched" first before the actual
volume was in sync with the displayed value.