[git] IDEA-99887 Don't cache revision content
workaround for IDEA-99154 Mac IDE launcher doesn't pass correct environment variables
javafx: template project initial
javafx: default description
[git] [hg] Don't cache revision content for Git and Hg

All revisions are local, and they load quickly, let's keep them out of cache to avoid sync issues and save memory.
[vcs] code style, nullable
Default ${DS} (dollar sign) template variable added (WI-8979)