Add getEditorOverlay and getCodeMirror methods on the editor widget
Add private constructor to the final constant class
Add completion related event types
Remove static on() methods in editor overlay, change parameter type of
non-static ones
Add information in the gutter click events
PLGEDT-44 Codemirror editor implements HasLineStyler
Use jseditor constants for gutters
PLGEDT-44 Add gutter for breakpoints
Add style for gutters