Java arglists: include type metadata

[vemv]

For a given Java arglist (as used in *cider-doc*, etc) like [this key], we can also include:

• the return type
• the type of each param (except that of this)

So the example would become: ^Integer [this ^String key]

classes other than java.lang's should be fully-qualified.

Pay attention to primitives.

Disregard generics.