ooi_command: new command argument types 'option' and 'number'

ooi_command: initial commit that integrates command change request
Merge branch 'v0.7' into v0.6

Backporting maintenance fixes from newer branch
Adding widgets
worldstate_info: adding missing readonly preference setting
Merge branch 'v0.6' of crisma.ait.ac.at:crisma/wirecloud-widgets into v0.6