Add ui backend selection in CMakeLists.txt (default SDL1)
Updated how to build doc to cmake and ui backend selection
Setup to implement sfml2 backend
Fix syntax error in CMakeFiles.txt
Merge branch 'backend-selection' into sfml2
Using CSFML instead of SFML
WIP sfml implementation
Precise texure size when drawing points and lines (SFML)
SFML implementation working
Fix remanence setting
Clean up backend implementations
Fix coef handling in SFML2 backend
Fix SEGFAULT when there's no X11 Display