Integrate ALE interpreted engine in GEMOC Studio build

[dvojtise]

This PR integrates the ALE interpreted engine to the studio.

ALE interpreted engine comes with 2 parts:

• ALE language is distributed as a prerelease (Official release should come from ecore tool project)
• ALE engine comes from a new github repository: https://github.com/eclipse/gemoc-studio-execution-ale

This PR

• adds ALE language to the studio
• compiles and add the interpreted engine in the master build.
• adds a new section in the development documentation.

It also changes the name of the launchers in the run configuration. Instead of Gemoc Sequential eXecutable Model, they now use the following scheme: Executable model with GEMOC Java engine, Executable model with GEMOC ALE Interpreted engine, ...

This PR comes with https://github.com/eclipse/gemoc-studio/pull/126 and https://github.com/eclipse/gemoc-studio-modeldebugging/pull/77