[python/games] Expose GameInfoTag properties to Python list items.
Add repository for new ROM Collection Browser with "Game Add-on" support
[python] Allow Python xbmc.Addon objects to be constructed from uninstalled add-ons.

Only getAddonInfo() is available to uninstalled add-on objects. Attempting to get/set settings or location strings will have no effect.
[python] xbmc.Addon.getAddonInfo() can return "extensions" and "platforms" properties for game client add-ons
[JSON-RPC] New parameter for Addons.GetAddons, "uninstalled", to get add-on info from remote repos.

Example: Addon.GetAddons({"method": "Addons.GetAddons", "params": {"type": "xbmc.addon.video", "enabled": "uninstalled"}})