Move Linux to 5.9.3

Add support for volatile Facts/Parameters

No comm timeout on high latency links

Fixed crash in FactMetadata constructor.

It did not like the use of the tr() macro within a static QString in the constructor.

Offline map fixes

Fixed an issue when importing a tile set that already exists would cause an error. When an imported set has a same name, it is renamed so the name is unique. The original logic had an error and was allowing the "new" set to be added with the same name, which would cause an error. In addition, if a new tile set brings no new unique tiles, it is now ignored.
Fixed an issue where the progress was based on the total number of incoming tiles but this total can change if a given tile already exists in the database (it is not added).

iOS using wrong Xcode

Fix Android slider

PX4 Firmware: Update param meta

Since disconnectAll will kill this controller before it gets to next
statement

High Latency Link bit support

Update PX4 MockLink params to latest firmware

Add camera definition for Sony NEX-5R with 20mm lens

Parameter Editor Category->Group hierarchy support

Remove nmea serial port for mobile builds

WIP: Try turning iOS back on in Travis

Speed up pull request OS X travis builds

Fix unused variable