Info Widget: Roll back fix for #389, and set static column width.

Dynamic column width pegs the CPU and make the applicaton unresponsive.
TableWidget is not the best view for this sort of data and update rate,
issue #400 is for updating this to a better widget.
UAS: Fixes #399 issues with conversion from floats not being cast to double.
UAS: Update conversion to use Plain Old Types to avoid conversion errors.
Configuration: Update to 2.0.12
configuration: Update Version Object
Release Notes: Update to 2.0.12
Fix release note header to read 2.0.12
Merge remote-tracking branch 'upstream/master' into 274
UAS: Fix for double QVariants not being checked for alongside float
Comms: Fix for Serial Port errors not propagating up to inform the user, and added retries on connect() calls
configuration: Update to 2.0.13 to fix type conversion issue
configuration: Update json version object
configuration: Update Release notes
Merge remote-tracking branch 'upstream/master' into 274
Comm Settings: Change to better sync com port between Link and Widget
Settings View: Fixes #401 incomplete label display in settings
Settings View: Add checkbox to enable 'beta' releases
Autoupdate: Add check for update type

The update type can be 'stable' or 'beta'. It will also allow adding 'daily' in the future if required
QGCCore: Fix to remember if update is 'beta' or 'stable'
Autoupdate: Fix debug message