Enable getting Viking Version as a number from a string to enable comparisons.
Automated check for the latest version. ATM only on Windows systems.

Access the 'VERSION' file on the website which should hold the latest Viking version.
[QA] Fix missing G_BEGIN/END_DECLS
SF#3314896: Show/Hide All Tracks (Routes+Waypoints too) of a Layer.

Includes toggling the visibility
Add Show/Hide all Layers within an Aggregate Layer.

Especially useful for managing groups of TrackWaypoint Layers within an Aggregate Layer.

Includes toggling the visibility