Extended function support

[vietj]

Currently we support java.util.function.Function, we could extend it to support any functional interface declaring one parameter and a non void return type, so Function, IntToLongFunction.

This will require to have proper support in code generators (JavaScript, Ceylon and Scala).

[inikolaev]

@vietj I will try to look into it. There's a lot stuff going on in the code and I need some time to figure it out.

One idea from the first look is to create FunctionalInterfaceTypeInfo class which will handle all functional interfaces both parameterized and not.