Add Default Projects Folder to Browser

[manongjohn]

This PR fixes #996 by adding an entry for Projects in the File Browser if a Default Project Path is set. In case of multiple paths (separated by ;), multiple entries will be created with the base path name appended to Projects.

[DarrenTAnims]

Amazing!!
Thanks MJ

[artisteacher]

Works well with macOS!

I did find that if I add a second path later on in a different session, three project directories temporarily display in the Browser, until T2D is restarted:

• Projects
• Projects (1st name)
• Projects (2nd name)

[manongjohn]

I did find that if I add a second path later on in a different session, three project directories temporarily display in the Browser, until T2D is restarted:

I see the problem. It's replacing the wrong entry when you update root Project folder list. In Windows, there is an entry in the folders list for Network that doesn't exist in macOS/Linux versions so it's replacing whatever normally follows the Projects folder (recent open projects lists). Because of this, if you click on the wrong Project folder, it will crash T2D.

I'll submit a fix shortly.