camera: fix for changes in mosaic API
mp_tile: add service to tile key

this ensures that when you switch services that we stop using the
previously cached tiles for the old service
mp_slipmap: update service selection drop down on cmdline service change
allow loading of external modules using full module name

internal modules are tried first, then external
camera: fixed mss bug and added some debug code
camera: enable mss=96 

the maximum packet size has been expanded in APM
cuav: moved modules into cuav repository
fixed exception on module already loaded