provide multi-line comments in hql-editor

According to https://issues.jboss.org/browse/JBIDE-6974, comments are provided, but only one-line-comments via --. This is a limitation!

Especially, multi-line-comments should be provided by /comment/.

/* . . . */ is supported in SQL.

Especially in hql-editor, multline comments are more sensefull than one-line-comments.

Imagine, I have 20 queries, I am forced to have 20 hql-editor instances in my ide!

This does not only cost RAM, it is also not user-friendly to handle 20 different hql-editors-instances instead of only one, in which the user can comment out different queries via multi-line.

Please provide a full support for comments in hql-editor, one-line AND multi-line comments.