Fix the Waypoint parameters - issue #337

Added Acceptance radius
Added Orbit radius setting
Missed the units for acceptance radius in XML file
Change the text 'No Camera Available' to 'Waypoint Type' of Waypoint type spinner in Mission dialog boxes
Merge pull request #338 from azrin1972/FIX-MAV_NAV_CMD_WAYPOINT

Fix the Waypoint parameters - issue #337