Add camera chase feature

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This feature is made up of three main components:
 - Output of positional data, controlled by a flag in options.h (the UDB should send out its position 
(lat, long, altitude) and an identifier)
 - Parsing of received positional data from other planes, with a configurable filter (we only parse for 
a specified identifier)
 - Option in the camera_viewport field of the waypoints to target a specified UDB, by identifier. When 
this viewport is defined, the camera target will be set to the parsed position 
of the UDB matching 
the identifier.

Original issue reported on code.google.com by adam.bar...@gmail.com on 21 Apr 2010 at 11:49

• Blocking: #22

[GoogleCodeExporter]

This is being worked in the "MatrixPilotCameraChase" branch, which can be found 
at 
http://code.google.com/p/gentlenav/source/browse/#svn/branches/MatrixPilotCamera
Chase. Please only check 
in changes that will compile (even if not yet tested).

Original comment by adam.bar...@gmail.com on 21 Apr 2010 at 11:50

[GoogleCodeExporter]

Original comment by benjie on 16 Jun 2010 at 4:59

• Added labels: Milestone-Release3.0
• Removed labels: Milestone-Release2.5

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Original comment by benjie on 22 Nov 2010 at 7:28

• Added labels: Milestone-Release4.0
• Removed labels: Milestone-Release3.0