Refactoring: Moving the waypoint class to the DroidPlanner project.
Refactoring: Fixing references
Refactoring: Switching waypoint fields from public to private.
Change the waypoint class to be a warper of the mavlink message "mission_item".

This way we have access to all the other fields of the mission_item class without creating a new object. This is the first step in the direction of fixing issue #133.
It may be better to warp the mission_item in a field then extending it.
Adding other fields from the mission_item object.
Starting to work on a mission editor.
Temporally moving the initial screen to be the Planning screen
Change two numerical constants for their definitions.
Merge branch 'issue133_relativeAltitude' into issue55_waypointEditor
Add a command column to the mission table.
Fix the command column so it changes the waypoint data.
Adding a button to remove waypoints.
Renaming package.
Fixing reference problems caused by the last commit.
Adding the option to change the waypoint altitude.
Partial fix on a bug with the MissionWritter.
Now it write more parameters from the object and less constants.
Fix some bugs with the mission Reader.

Now it uses more fields from the file, instead of constants.
The numerating issue has been fixed in the last commit.
Merge pull request #174 from arthurbenemann/issue55_waypointEditor

Waypoint editor, first go