Editor : Grab keyboard focus on enter
Editor : Grab keyboard focus on enter

This allows custom extensions to add shortcuts for any editor. It also fixes #495.

hradec/gaffer,appleseedhq/gaffer,ImageEngine/gaffer,hradec/gaffer,lucienfostier/gaffer,appleseedhq/gaffer,andrewkaufman/gaffer,johnhaddon/gaffer,boberfly/gaffer,andrewkaufman/gaffer,hradec/gaffer,GafferHQ/gaffer,boberfly/gaffer,boberfly/gaffer,GafferHQ/gaffer,andrewkaufman/gaffer,appleseedhq/gaffer,appleseedhq/gaffer,boberfly/gaffer,ImageEngine/gaffer,GafferHQ/gaffer,GafferHQ/gaffer,johnhaddon/gaffer,johnhaddon/gaffer,andrewkaufman/gaffer,johnhaddon/gaffer,GafferHQ/gaffer,lucienfostier/gaffer,lucienfostier/gaffer,hradec/gaffer,lucienfostier/gaffer,andrewkaufman/gaffer,johnhaddon/gaffer,ImageEngine/gaffer,ImageEngine/gaffer,hradec/gaffer