mp_image: added set_title() API

set titles on viewed images in mosaic
optparse_gui: show title based on description
add service pulldown to mp_slipmap
fall back to cv if cv2 is not available
mp_image: added auto_size option

useful for mosaic window
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
slow down input a bit in setup mode

this is friendier for the PX4 serial console, preventing loss of bytes
due to interrupt storms
mavflightview: support PX4 native SD log format
widgets: added menu controls 

this will allow for menus on all windows
.gitignore egg-info from messy builds