Add support for extraParams.hxml parsing

[Dreaded-Gnu]

Hello,
how can we achieve to add extraParams.hxml parsing? I'm using following library at the moment, which uses a macro that extends the class path, since I'm referencing a submodule that isn't published to haxelib: https://github.com/Dreaded-Gnu/haxe-amqp.

This leads at the moment to a wrong parsed library, since the intellij plugin seems to only support classPath from haxelib.json