Add problem 33 description (Image Paths)
Refactoring:use texture filenames instead of paths
Add simple config code, add GraphicsQuality to it

Now player can add content from the remastered version of CaveStory,
edit config.cpp file, recompile it (well, game settings will be improved
someday), and run application with new graphics.
Update README media content note.
Open game window centered not fullscreen
Not add remastered bitmaps to repo (gitignore)