Log Message:
Update gmtk to 1.0.8.

1.0.8
    Updated Spanish translation
    Updated Japanese translation
	Rework initial subtitle visibility setting
1.0.8b
    Updated Korean translation
    Run make update-po
    Add message when screenshot capture fails
    Switch to GLIB for GMLIB header files, since GTK is not included
    Switch to GTK VERSION tags when possible
    Updated Japanese translation
    Fix compliation of gmtk_media_tracker in generic application
    Run make update-po
    Remove audio export filter when codec cannot use it
    Remove cairo variable from gmtk_media_player
    Version bump to 1.0.8a
    Use cairo and the draw event to draw the background in GTK3
    Set background color in gmtk_media_player widget using specific realize events
    Address parallel build problem from Issue #11