Add "(re)install dependencies" button to settings

[SonnyX]

As a developer, I want to have a dynamic list of dependencies so that I can control dependencies in a generic way.

As a user, I want to be able to reinstall dependencies, in case there is an error.

Acceptance Criteria:

"Reinstall Dependencies" button in Settings menu
UE3Redist.exe be removed as hard-coded value
Add "Dependencies" array of objects in version JSON file under "game", including UE3Redist.exe
Each dependency object includes: Name, URL (Relative)