SVN_SILENT made messages (after extraction)
SVN_SILENT made messages (.desktop file)
splash: Fix loading of 'appIcon' under Windows

This needs to be a URL, rather than a string.

Fixes:
warning: Warning:file:///r:/share/kdevelop/splash.qml:106:5: QML Image:
Protocol "r" is unknown
app: Streamline env variable checks
Remove references of IGenericProjectManager

This interface got removed long time ago