JCF: Implement basic generics support. Issue #16128, patch from Julian Puhl.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@46971 4005530d-fff6-0310-9dd1-cebe43e6787f
JCF: improve parsing "operator". Patch from Julian Puhl.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@46972 4005530d-fff6-0310-9dd1-cebe43e6787f
JCF: Support for "enumerator" operator. Patch from Julian Puhl.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@46973 4005530d-fff6-0310-9dd1-cebe43e6787f