Add Util Class to read Model Extension Point of Papyrus.

Adds an util class to read file extensions and save parameters of models
registered to the Papyrus model extension point.

Includes testcases.

Signed-off-by: Stefan Dirix <sdirix@eclipsesource.com>
Change-Id: Ib6106ad46036e1aa1818bc955c9ae5556cca6fcf
20 files changed