fix: app data, prefs and library are stored in version specific location (#346, #369)

[Oliver-Loeffler]

As all application specific locations are now version specific, multiple versions of Scene Builder can now be started at same time, as long they have different versions. Also each Scene Builder instance will have their own settings and library (e. g. it will work to run Scene Builder 8 with different settings than Scene Builder 19 SNAPSHOT).

As logfile names already include the Scene Builder version, logfiles are still stored in users home subdirectory .scenebuilder.

Drawback: There is no functionality yet to import settings or user library from an older version of Scene Builder. If desired, this should be a different PR.

Issue

Fixes #369
Fixes #346
Potentially solves issue #395 (only when SB launched from IDEA has different version than 19)
Fixes #733

Progress

• Change must not contain extraneous whitespace
• License header year is updated, if required
• The PR name must follow the pre-defined format
• Verify the contributor has signed Gluon Individual Contributor License Agreement (CLA)

[Maran23]

Maybe as an idea: Godot solves this by creating a new settings file that is derived from the newest previous settings file, if there is any.

Godot then tries to find the newest version in a while loop and creates the settings file out of it.
Or a completely new setting file, if nothing exists yet.