Feature/add label to shape circle

[rafavalpa]

drawController.js

• Add isNodeNameConnector method to drawController

circle.js

• Make shape and label as draggable
• Add Connector neeeded methods
• Add the limitShapeMove method to circle

editor.js

• Call the updateConnector circle method when updating anchors

draw.js

• Add the getShapeClosestParentGroup method
• Add the setLabelListeners method
• Use the new circle methods, limiting its call only for the circle shape

[ivmartel]

This is made obsolete with the work done for #1020