Implementation of the validation method.
Outline and folding have also been inhibited.

Manifest
- change of some bundles versions

Plugin
- Extension for a custom marker for aria templates errors

Document
- implementation of methods to add, remove, and format the error message of markers. Markers are added directly on the file.

Document listener
- removal of error markers after a document change

Marker Annotation Hover
- implmentation of a class that is in charge of creating the message to diplay when the user hovers on a marker.