API: Add more parameter types and improve info

API: Add more parameter types and improve info

New types 'text' and 'password' for where a <textarea> or
<input type="password"> would be preferred over <input type="text">.

Some timestamp parameters get actually tagged as 'timestamp'.

'submodule' types change the 'submodules' output property from a boolean
to an object indicating the mapping from values to module paths. And
they get an indication of the submodule parameter prefix (e.g.
generator's "g"), if applicable. "generator" actually gets reported as a
submodule type, using this new mechanism.

action=paraminfo will now indicate ApiBase::PARAM_RANGE_ENFORCE status,
and return better-formatted defaults for timestamps and booleans.

Change-Id: Ic862d6f8fe13f7eb6b4298683514d33af5823e47