Update to new mavlink ROI commands

Remove dead links and streamline readme.

Custom Command Widget: Fix all the horribly broken stuff

Update README to 5.9.3

Fix AutoConnect settings for iOS

Fix double-close bug on OSX

Hack dialog was causing extra window

Move Android to Qt 5.9.3

Seems to work fine without out.

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