Added missing Eclipse formatter support up to version 4.17. #722
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Added missing Eclipse versions for formatter extension up to version 4.17.
The default formatter version is now 4.17, except for CDT formatter, since CDT 10.0 requires Java 11.
A default version depending on the the executing JRE version is discouraged, since this would mean that the desired formatting may change dependent on the underlying JRE version. A general approach should be taken in future how to deal with the fact that more and more formatters do not work anymore with Java 8.
This PR demonstrates that most Eclipse 4.17 formatters still work perfectly with Java 8. Hence it is recommended to close #547.
This PR makes Groovy-Eclipse 3.9.0 the new default formatter, which solves #685.