Removed all QtGui, replaced with SDL2.
SDL Keys instead of Qt keys.
Keypad support. Fixed cursor and grid lines.
Grid is textured, not painted. Minor fixes.
Dotted line textures. New grid drawing. Dotted selection rect.
Text output in SDL using XPM-based pixel font (from Miniban).
Fixed previous commit: font files. Replaced QGetopt with plain getopt.
Removed all Qt classes from use.
Fixed selection rect.
Fixec color string representation.
Removed Qt project file, added plain Makefile instead.
Fixed README to reflect latest changes.