Added different resolutions for rendering/displaying
This allows the user to display a quick&dirty version while rendering at much higher/lower resolutions and keeping the window the same size
Merge pull request #2 from Mischa-Alff/master

Changes CMakeLists.txt to use more suitable debugging information and optimize even when the Release type isn't specified
Added a few little configuration options in the main code file
- Number of threads
- Display resolution
- Render resolution
- Display Interval
- Also added better window title and filenames
Merge pull request #3 from Mischa-Alff/resolutions

Added several configuration options in the main file, added usability stuff
Gamma-correct textures when loading them.

Textures now don't look washed out anymore.