DevKit: <depends> "optional" -> boolean
IDEA-87999 DevKit: run configuration should default to "Allow only once instance"
SuperClassHasFrequentlyUsedInheritors: fix description display
Merge remote-tracking branch 'origin/master'
cleanup
init WEB-6998 Built-in webserver default port is not possible to change
ui settings
WebServer -> BuiltInServer
WebServer -> BuiltInServer
WebServer -> BuiltInServer
fix initial server header value (don't show null)