Downloading origin and web plugins through installer

Also make a pyproj for SteamShortcutManager. I develop my Python in
PyCharm, so the pyproj is just for Visual Studio compat
Add some SteamShortcutManager code
PEP8 filenames ain't StyleCop.
Add cli and build to SteamShortcutManager
Install and updater code
Merge pull request #21 from ron975/cefsharp

RTF changelog update