dumb, openmpt: disabled "type" field in caps for now

Signed-off-by: Carlos Rafael Giani <dv@pseudoterminal.org>
enabled gme plugin by default & changed static lib to shared lib

removed local plugin install path notes, since this feature does not play
well with the base class shared library

Signed-off-by: Carlos Rafael Giani <dv@pseudoterminal.org>