Added menus, markers and methods to visualize debugging in the editor and add, remove and navigate breakpoints* . * arrow_right.png: Icon to indicate debugger position. * redled.png: Icon for a breakpoint. * file-editor-tab: Added methods to add/remove breakpoints and menu entries. * file-editor: Added methods to add/remove breakpoints and menu entries. * resource.qrc: Added new icons to resource file.

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