GitignoreDirectoryMarkerProvider migrated to LineMarkerProvider
Cleanup unused inspection

  - reimplement with visitor
  - reuse reference
  - add tests
Cleanup dupilcate inspection

  - reimplement with visitor
  - add tests
Disable quickfix for relative paths
change group name
Add remove-entry quick fix
Mute incompatible test
Cleanup dupilcate inspection

  - reimplement with visitor
  - do not use List for contains operations
  - extrac remove-quickfix
  - add tests
Many files support for 'Add to .gitignore'
Fixed #17 Prevent adding duplicate entries
v0.5
v0.5
utils refactoring
bnf fix for leading slash
IgnoreFileGroupAction refactoring
remove entry with CRLF if following
remove entry with CRLF if following - NPE fix, handle previous sibling
v0.5 re-release