Unreal Binary Builder v2.6.1
Add information about how many files compiled per step and total files compiled.
Support canceling zipping.
Support directly zipping and skip building if Engine build exists in LocalBuilds\Engine
Fix "The path is not of a legal form" when zipping.
Fix GameConfiguration might be missing when preparing command line.
Refactor PrepareCommandline function.
Added GameAnalytics for the app.