Clarify official example names and new project wizards wrt to the used engine

[dvojtise]

The wizards for installing official examples and the wizards allowing to create projects don't make it clear which engine will be used.

I suggest that:

• the example wizards should clearly indicate the name of the used engine (Java xDSML, Moccml xDSML, ALE xDSML, ...) between parenthesis after each language example name.
• the "GEMOC Melange Project for Sequential xDSML" new project wizard should be renamed "GEMOC Melange Project for Java xDSML"

BTW several "new project wizard" are missing but this should be taken into account in separate issues (ALE xDSML, GEMOC DSML) (note: GEMOC DSML is the base for language fragment, ie. contains a dsl file that can be used as input by melange with, for example, an ecore, an xtext, sirius, but no semantic )