Add concurrent engine to the studio

[dvojtise]

This PR adds the build support and deployment of the concurrent engine in the studio.

cf. https://github.com/eclipse/gemoc-studio/issues/146 It comes with several PR in other repositories:

• https://github.com/eclipse/gemoc-studio-moccml/pull/1
• https://github.com/eclipse/gemoc-studio-execution-moccml/pull/1
• https://github.com/eclipse/gemoc-studio-modeldebugging/pull/98
• https://github.com/eclipse/gemoc-studio/pull/148