Not compatible with Cake v1.0.0 - Need to change parameters to multi-dash syntax

[schuettecarsten]

This runner is not compatible with Cake-1.0.0. According to https://cakebuild.net/docs/getting-started/upgrade, parameters should always be called with multi-dash syntax (e.g. --target=Foo) instead of (e.g. -target=Foo).

# Start Cake
Invoke-Expression "& `"$cakePath`" `"%mr.Cake.script%`" --target=`"%mr.Cake.target%`" --verbosity=`"%mr.Cake.verbosity%`" %mr.Cake.arguments%";]]></param>