Bug 515277 - [Requirements] Support boilerplates (templates) to write requirements text easily

Creation and integration of a Xtext editor that allows to use
boilerplates (templates) to write the requirements text field easily.
The editor was integrated to Papyrus by extending its extension point
org.eclipse.papyrus.extensionpoints.editors.DirectEditor. I created a
constraint to activate this editor only when SysML Requirements are
selected.

Change-Id: I17a4f580b187fac8de53cc55752bf29bf40679f4
Signed-off-by: Mauricio ALFEREZ <mauricio.alferez@cea.fr>
117 files changed