Bug 514634 Fix regression

[Fix] Remove usage of org.eclipse.ui.forms.widgets.FormToolkit.* in
LaunchConfigurationDaialog
[Update] Adding API to support different Widget toolkit renderer for
SymbexWorkflowView and LaunchConfigurationDaialog

[Amend] Fix Copyright in AbstractSectionPart
[Amend-2] Rename Developer flag: SOLVER --> SOLVING

Change-Id: I0b5198168a20f0830b138db8b2c8d56c4e8d74d7
Signed-off-by: Arnault Lapitre <arnault.lapitre@cea.fr>