NO-JIRA : added a hook inside caEditorInspector to allow plugin interaction.
new hook is hookAppendToEditorInspector, it requires an array as parameter (as usual), containing the object shown by the editor (object, entity, set...) as "t_item" ; it returns its parameter array augmented with a "caEditorInspectorAppend" with html to add under the inspector.
That allows to add side contextual function buttons through plugins.
Merge pull request #63 from ideesculture/museesdefrance

NO-JIRA : added a hook inside caEditorInspector to allow plugin interaction