Merged hocon module to ScalaCommunity as it significantly can simplify build and it also fixes running tests for ScalaCommunity project.
plugin update branch switch suggester and settings

- rename ScalaApplicationSettings to ScalaCompileServerSettings
- add plugin update branch switcher setting in plugin settings
- add update hint for idea eap builds
Ahead-of-time completion
Scala style inspection re-enabled
Workaround for idea bug in external system. This fixes {Play SBT projects can't be imported in IDEA CE} #SCL-7837
Merge remote-tracking branch 'origin/master'
ScalaParameterCompletionContributor: check whether prefix is empty