libee/ee.h:
+ Added ee_color_names[] containing our 16 color names.
libee/ee.c:
+ Extended our color set to the full 16 instead of 10.
+ Precalculate ncurses attributes.
libee/graphics.c:
+ Clip color value in ee_set_color().
+ Clip characters in ee_putchar().
+ Partially clip characters in ee_putstr(), overflows aren't checked yet.
libee/ee_internals.h:
+ New file to share extern variables within libee.
test/demo.c:
+ Added a simple demo_color() to output all colors.
+ Replaced four ee_draw_line() with ee_draw_thin_box().
+ Replaced x1, y1, x2 etc. with xa, ya, xb etc. because <math.h> already
defines y1.
+ Randomized colours from 0 to 15 instead of 1 to 10.
src/Makefiles.am:
+ Added -lm to the ttyvaders linking flags because of the intro.
