[Improvement] Handle relative paths for user provided directories #230
Description
There are a number of configuration variables for paths to the DataDirectory, UserImageDirectory, UserVideoDirectory, UserAudioDirectory and Podcast RecordingDirectory. Relative paths in these variables currently lead to an interpretation relative to the current working directory, which is typically the program installation folder.
This folder and other folders in the vicinity can and should not be written by the user.
It would be better to make such paths instead relative to the user data directory. For the user data directory itself a relative path could e.g. be interpreted relative to the platform Documents directory.
Working on this issue on branch fix-relative-paths.