IDEA-111637 Gradle: on running one from 7 recent tasks, number of recent tasks decrements by one

Code style
IDEA-111637 Gradle: on running one from 7 recent tasks, number of recent tasks decrements by one

Minor refactoring
a way to get SeverityRegistrar from within platform
notnull
notnull
createInspectionContext available to platform
reverted
notnull
dead code
cleanup
IDEA-109465 partial rollback
IDEA-109465 partial rollback
IDEA-97264 IntelliLang support for "Path to File" language
IDEA-97264 IntelliLang support for "Path to File" language: @Reference dropped