[TextEditor] Fixed bug in replace all.
Revert "[NUnit] Updated NUnit to 2.6.2."

This reverts commit f93a73e3c87d4c8b6a45978a9b89cbfa0e5caa21.
[TextEditor] Fixed failed unit test.
[Ide] Fix global command search

The search now includes commands which are valid
in the currently active pad or document.
[TextEditor] Fixed issue in selection system & made block selection
more mature.