[431647] Clean methods
AbstractSiriusSwtBotGefTestCase.openRepresentation

* SWTBotDesignerEditor renamed into SWTBotSiriusDiagramEditor
* SWTBotDesignerGefViewer renamed into SWTBotSiriusGefViewer
* SWTBotDesignerHelper renamed into SWTBotSiriusHelper
* Methods AbstractSiriusSwtBotGefTestCase.openRepresentation renamed
into openDiagram and marked as deprecated. Methods to replace with the
new openRepresentation methods, that now return a generic SWTBotEditor
(and not SWTBotSiriusDiagramEditor).

Bug: 431647
Change-Id: I1ca41c17798a97767b9ce1f9b214338df9fd0326
Signed-off-by: Laurent Redor <laurent.redor@obeo.fr>
[430527] Fix pack200 creation

Extract a "pack" profile which does just packing (and can be tested
locally) from the "sign" profile which does the signing (and only works
at Eclipse).

Bug: 430527
Change-Id: I1a591700084ebf367e34bf7c17ff4ad48aac5ec5
Signed-off-by: Pierre-Charles David <pierre-charles.david@obeo.fr>