Fix build without SFML render window in OpenGL canvas
Merge pull request #162 from alexey-lysiuk/fix_ogl_nosfml

Fix build without SFML render window in OpenGL canvas
Don't show mouse dwell tooltip in text editor if the cursor position is invalid

Fixes #160
Some tweaks to 'Square+Sprite' and 'Framed Sprite' thing display
Fix blank line in UDMF thing info overlay
Merge branch 'master' of https://github.com/sirjuddington/SLADE into osx