Merge add colors into constructor of gradient pattern. Since we also define color stops for gradient pattern and rear change it, mbe_pattern_add_color_stop_rgba() is merged into mb_pattern_create_radial() and mb_pattern_create_linear(). It also makes porting to graphic engines easier.

m4datadir = $(datadir)/mb
dist_m4data_DATA = foreach.m4 mb_c_header.m4 mb_c_source.m4
dist_bin_SCRIPTS = svg2code.py