Initial GeoTag implementation

Small tweak to serial ui

Must use pack_chan and encode_chan due to mav 2.0 problem

_finalize methods need information which is not available if all you
have is a mavlink_message_t

Handle redirects in file downloads

Major Survey UI rework

px4firmwareplugin: fix minimum required version comparison

before, with a version of eg. 1.5.0, the user was wrongly notified.

Survey: Fact Meta data

Initial ArduPilot Rally Point support

QGroundControl v3.0.1

-Attitude indicator correctly updates when displayed in horizontal orientation instrument panel (small phone screens, virtual joystick turned on)
-Video working correctly on Windows
-Properly convert knots to m/s
-Fix crash on Vehicle disconnect

Removing forced Mac OS SDK.

Virtual Joystick: Draw outer circle as well for better visual

VTOL takeoff/land waypoints label VT/VL

Adding Sony a6000 to camera list

Linux add icon with setWindowIcon

Sony a6000 ILCE-6000 with 16mm lens.
Source : 
http://www.sony.co.uk/electronics/interchangeable-lens-cameras/ilce-6000-body-kit#product_details_default

-fixes #4073

Survey: Corrected EOS-M focal length

it's not a typical APS-C sensor, proper size gives more accurate
calculations.

-fixes #4035

The 22mm as stated on the lens is actual, not 35mm equvalent as on smaller
cameras.  - So it was wrong to reverse calculate for crop factor.