Merge remote-tracking branch 'origin/f-predictor-fix' into develop
fixes : no more infinite loop with the mouse keyboard + (see below)

- Autoclick cursor indicator
- Scrolling : Pause/Resume fixed (used to register when resuming)
the word predictor now reacts to the new sendkey service
The prediction doesn't add a space when the predicted word ends with an apostrophe ( ' ).
Making sure Sybille predicts words after an apostrophe
fixing the scroller, releasing patch 2.6.1
Merge remote-tracking branch 'origin/develop' into f-predictor-fix

Conflicts:
	Plugins/Prediction/CK.WordPredictor.Sybille/SybilleWordPredictorEngine.cs
	Plugins/Prediction/CK.WordPredictor/TextualContext/TextualContextService.cs
Retry failed predictions
Changes IPredictionTextAreaService interface : remove IPropertyChanged, and update it to a strongly typed bus to publish PredictionAreaContent event args
Removes INotifyPropertyChanged from ITextualContextService. ITextualContextService implements its own Events
Replaces IReadOnlyList by ICKReadOnlyList