libcamiface, py cam_iface: API CHANGE: convert frame_offset/frame_size to frame_roi
libcamiface, py cam_iface: API CHANGE: convert frame_offset/frame_size to frame_roi

git-svn-id: 61f6c46cd71a62c9ff9000a8bb18f52bc6a6f3a9@750 9608957c-362e-0410-90bb-ddb82fccb57f

motmot/pycamiface