Fix Catalina missing system apps

[underthecocotree]

Prior to this change, while searching to find system apps there were no hits. Catalina seems to have the applications under System/Applications
eg Calendar.app Mail.app

This change adds the System/Applications folder to the default application search folders

Issue: #278

[oliverschwendener]

I think we should add this folder only if the user is running macOS Catalina or newer.

[underthecocotree]

You mentioned that before and I kind of agree.

Should I add a function in src/common/helpers/operating-system-helpers.ts that checks for the version of mac running.

Then based on that add the location to the applicationFolders array.

Or we can test if the directory exists and then added that way we don't really have to check for specific os version.

What do you think?

[oliverschwendener]

I wouldn't check if the directory exists because that code should be asynchronous and this will complicate the synchronous code that merges the user configuration with the default.

I would use nodejs's os.release() API to check the current version of the operating system.

[oliverschwendener]

Will close this due to inactivity.