* gmc-chargrid.c (gmc_char_grid_get_size): New public function.
(gmc_char_grid_put_text): New public function. It is the same as
gmc_char_grid_put_str, but can take any arbitrary string plus its
length.
(gmc_char_grid_put_char, gmc_char_grid_put_str,
gmc_char_grid_put_text): These functions now take a background
pixel parameter --- the GmcCharGrid widget now supports fg/bg attributes.
* gmc-chargrid.h: Changed colors field to attrs.
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