[Project Player Management]] Invitation to join Projects & Organizing the Joined Projects list

1) A 2 Tier Invitation Model so players can decide whether to be added to a Project after being invited to a Project. 

3) Gametize app: On another note: It will be helpful if we can introduce a "Starred" system to the "My Games" in the interim, where they can choose which Projects they want to see upfront, or in a different tab.

Personally I am also struggling whenever I am doing demos. Also, when a person is newly invited to a Project, it could also show up within another tab. I imagine the following tabs: Latest  | Starred | Invited | Archived (this one is not unjoined projects, but Projects that players just want to put on backburner without deleting their completions).