Fix crash by invalid socket deletion

Optimize SQL set creation.

MAVLinkLogManager: fix use of wrong variable

Calling delete on a socket callback is not safe and this can crash
QGroundControl. Using deleteLater method from socket to perfom deletion.

previously the start log button was always disabled, even for PX4.

Fixes regression from 9d413108

SDL: warn with SDL error string when joystick feature detection fails

Mission auto load

ArduPilot: New firmware format

Remove old code with bad reference

AutoConnect list driven from json file

Use LZMA compression with NSIS for smaller installers

Should address #4425

Condition SDL counts so we don't pass negative numbers to new

Should address #4425

ArduPilot support for new FRAME_CLASS, FRAME_TYPE

UDP join multicast group for windows client

Mission Settings replaces Planned Home Position

XCode 8 workaround update

- Shot Interval in Survey
- Much change to time/distance calc

QGroundControl v3.1.1

Keep first link fallback when NO_SERIAL_LINK