s/SDL/GLFW/

Deprecated SDL 1 has been replaced by GLFW.  Thanks to the new graphics framework,
the game window is now resizable.  Some new bugs are introduced though,
such as the hardware cursor being visible.

The configuration file has been renamed to config.ini and the format
has been refactored.  The default resolution is now 800x600 (past: 640x480)
and AZERTY layout support was dropped.
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