geo lib: major rewrite of map_projection_XXX functions
Use updated map_projection_XXX functions in apps
mc_pos_control: operate in local projection instead of global frame
position_estimator_inav: mark local position as valid even if GPS not available (e.g. only FLOW)
geo lib: minor code style fix
vehicle_local_position: use double for ref_lat and ref_lon instead of int32, fix related apps
copyright and code style fixes
Merge pull request #1 from PX4/mpc_local_pos

Mpc local pos