OC-11119 don't use virtualFiles for cache directory, invalidate cache with "Invalidate caches" action
(cherry picked from commit d3de085)
(cherry picked from commit b8d214c)
Platform:
CacheInvalidator api improved
'invalidator' word added to the dictionary
(cherry picked from commit 729a0f3)
(cherry picked from commit d1ec388)
Platform:  CacheInvalidator api improved (javadoc improved)
(cherry picked from commit bdcec70)
(cherry picked from commit 720bb82)