Improvement of weston.ini.man. Add key:shell and remove tablet-shell
Improvement of weston.ini.man. Add key:shell and remove tablet-shell

Add description of key:shell to CORE SECTION and move a example of desktop-shell from key:modules to key:shell.
Add cms-colord.so to key:modules of CORE SECTION.

Signed-off-by: Nobuhiko Tanibata <92313f26b3566e64b50391ce0051fc0e1f775402@xddp.denso.co.jp>

xorgy/weston,Fantu/compositor-spice,sir-murray/weston,udoprog/weston,jonnylamb/weston,krezovic/weston,eyolfson/weston,Tarnyko/weston-xdg_surface_present,Gnurou/weston,giucam/weston,eyolfson/weston,mchalupa/weston,Fantu/compositor-spice,kwm81/weston,mchalupa/weston,sir-murray/weston,kwm81/weston,udoprog/weston,Gnurou/weston,xorgy/weston,giucam/weston,Tarnyko/weston-xdg_surface_present,jonnylamb/weston,Fantu/compositor-spice,krezovic/weston