Allow per-project Groovy compiler version

[mauromol]

I know this is a limit that most probably will never be fixed in Greclipse... but I felt like it should be tracked here, as well, as it was in the old JIRA (GRECLIPSE-1196).

It would be extremely useful and "natural" if the Groovy compiler version could be set on a per-project basis, just like JDT allows for the Java compiler level.

[eric-milles]

The problem is you can only load 1 Groovy runtime bundle within Eclipse. So the global setting determines which is loaded and the others are disabled.

[mauromol]

Yes, I know, this has always been the explanation I was given.
Perhaps some interface-based approach abstracting from the actual runtime being in use (instead of bundling the Groovy compilers as separate and alternative OSGi bundles) could have helped here... But I understand it would require an almost complete rewrite of Greclipse...