Add ability to generate arbitrary number of run configurations

[mutcianm]

What do you think about adding 3rd auto-generated run configuration in addition to scalaUltimat/scalaCommunity and scalaUltimate-noPCE/scalaCommunity-noPCE :scalaUltimate-noRebuildIt would have no "Before launch" steps. It would just start the dev IDEA instance with the latest locally-built Scala Plugin artifact, without rebuilding the project.PROS: you don't have to wait until indexes are rebuilt after Invalidate Caches & restart to start working with dev IDEA.I've added such configuration locally some time ago, but you have to update it each time other configuration settings are updated (e.g. when IDEA version is updated)

@unkarjedy