Temp maps keep their map slot now
Merge branch 'master' of https://github.com/sirjuddington/SLADE
Minor tweaks.
Updated sfmod to 1.1.0

Since SFML 1.6 compatibility has been dropped since
583313079f732f8833f12d97545d2a4f6392d5a8, it's not a problem.
Merge pull request #94 from Gaerzi/master

Sync with my fork.
Tweaked commonly used headers a bit, the biggest change would be removing the OpenGL headers from Main.h
Fix compilation with FTGL
Commenting and stuff
Mark archive as modified on entry sorting
Fixes for linux/gcc compilation
Fix for Windows compilation
Repaired UTF8 in saved file paths.

With a new UTF8 macro used instead of CHR.
Found some BMPs that failed to identify.

Yet are displayed without issue. So mellowed the conditions a bit.

Also tightened the SNEA identifications, so that DB2's two-byte empty
script lumps won't be interpreted as 0x0 pixel images anymore.
Merge branch 'master' of https://github.com/Gaerzi/SLADE into Music