Rebranding logo

add temporary Ouroboros logo, thanks Lenny for vectorizing

change logo file names

Desktop file now includes proper exec using the app binary name

fix genicons for use with libicns

launcher/Application.cpp

@@ -1148,7 +1148,7 @@ void Application::setIconTheme(const QString& name)
 QIcon Application::getThemedIcon(const QString& name)
 {
     if(name == "logo") {
-        return QIcon(":/logo.svg");
+        return QIcon(":/polymc.svg");
     }
     return XdgIcon::fromTheme(name);
 }