Add Record Me mode.

Record me allows recording of follow me path. Saves into waypoints folder in the same format as saved points from planning mode. Added a setting to enable disable recordme.
Extracting the Record Me mode from FollowMe.java to a new class.
Cleaning RecordMe.

Renaming functions, removing duplicated code for saving waypoints and removing unused variables.
Start using the Record Me function in the app.

Added a button to the planning screen to do the recordMe function.
And the code necessary to run it.
Merge branch 'master' into RecordMe
Fixed some bugs in the recordMe mode.
Now the first record waypoint is used as the home location.
And the waypoints list is cleared when finishing recording.
Changing the output filename of record-Me.
Removing the enable_record_me  preferrence.

We don't need a "in development" preference since this feature will hardly cause some damage to anyone.
Merge pull request #151 from arthurbenemann/RecordMe

The record-me mode is ready for production.