fix installer crashing if a folder is present in zipfile.
Installer now adds shortcuts. Downloader shows update source url
Restore currentreleaseversion file

Notify legacy users of updates
Refactor utils to new assembly
Use ProcessTools.Kill to close steam
Let user choose whether to close steam or not
Fix release build target
Update new link
Merge pull request #23 from ron975/cefsharp

update download url