Extensions (#737)

- add the current document title in the toolbar
- allow user extensions to define optional parameters
- more events for renamedElement, beforeClear, afterClear, sourceChanged
- remove "message" event used for iframe integration not used anymore. can be readded through a new extension if necessary
- default precision down to 2 digits (and applied in rotation)

cypress/integration/ui/clipboard.js

@@ -53,9 +53,9 @@ describe('UI - Clipboard', function () {
     cy.get('#svg_2').should('exist')
 
     // Delete.
-    cy.get('#svg_2').click().rightclick()
+    cy.get('#svg_2').click({ force: true }).rightclick()
     cy.get('#cmenu_canvas a[href="#delete"]').click({ force: true })
-    cy.get('#svg_1').click().rightclick()
+    cy.get('#svg_1').click().rightclick({ force: true })
     cy.get('#cmenu_canvas a[href="#delete"]').click({ force: true })
     cy.get('#svg_1').should('not.exist')
     cy.get('#svg_2').should('not.exist')