Fix header headers.
Add function for retrieving navaids from the storage by frequency.
Add ManagedString to State module.
Update way how <properties> is parsed (allow <directory> inside).
Graphic fixes for HSI.
Use names: vertical/lateral deviation and specify them in degrees.
Paint "normal" value in green above current value.
Fix for managed "boolean" property.
Fix painting EFIS when flight path marker is disabled.
Naming fixes. Reorganize property tree.
Small fix for alt ladder text positioning.