Improve docinfo (#2972)

* Change some imports to use installed robot

* Use installed Robot Framework libraries in libdoc import modules

* Add attributes and is_private for UserKeywords

* Show private keyword setting in ItemInfo Details

* Sort list of suggestions, fix left, right arrows. WIP use Tab to select and edit. DEBUG

* ENTER fills cell with selection. Tab to select and keep edit working, WIP

* Fixed list selection in Cell Editor. Values in Grid not saved to model WIP

* Update documentation

* DEBUG test_namespace

* DEBUG XML SPEC Import

* Skip some XML SPEC Import unit tests

* Condition utests on Windows

* Correct colorization for private kws from different files. Need to condition by Keywords table.

* Fix unit tests

* conditions different file and Keywords. WIP

* Complete solution for private keywords. Need to fix indication of modified items

* Update CHANGELOG

Author: HelioGuilherme66

src/robotide/editor/contentassist.py

@@ -12,7 +12,6 @@
 #  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
-from operator import index
 
 import wx
 from wx import Colour