IDEA-105751 Convert line separators: Provide an inspection which reports files with line separator different from project's default
[vcs] Unversioned Dialog: reuse existing actions

Extension of the fix for IDEA-105068: instead of creating new
instances of actions, use existing ones.
Delete action should have a separate icon, so create a separate
presentation for it.
It fixes IDEA-67408.
fix wrong assignment statement evaluation sequence (IDEA-105213 Code Fragment Evaluation results to wrong value)