Add TM Terminal and EGit features to Eclipse ESCET IDE/product

I propose to add two additional features to the Eclipse ESCET IDE:

• TM Terminal: This allows to use terminals like Git Bash (on Windows), and others. See #763 (closed) where we added it to our development environment. I miss it in the runtime/product, where it would be useful to run for instance Python and bash scripts. ToolDef is great, but sometimes I have other needs.
• EGit: This allows ESCET users to do versioning with Git. Git is the main used version control system at the moment. By integrating EGit, this makes it easier for users to use Git. Of course, it is optional. They can also opt to use Git outside of the ESCET IDE, or even use a different version control system.

Let me know what you all think.