Provide a html element selector element

First crack at this. Not sure exactly what I'm doing :)

Needs a bunch of work still. But if I'm going about it the right or wrong way, I'd appreciate someone telling me so.

Okay, here's a bit more. Also, a patch for views to use this on fields for "Customize field HTML", as a demo.

I couldn't find anything to base this on, so I made up some stuff. Passing on the #dependency and the #default_values may not be the usual way.

Only triggered elements get #submit callbacks. I was looking for #value_callback.

The texted field needed two dependencies.
Still use ctools-1089912-views-3.patch to test it.

+function ctools_element_info() {
+  ctools_include('elements');
+  return ctools_elements_element_info();
+}

Seems like we should use ctools_passthrough() for this (see ctools_menu() or ctools_theme() etc)

It seems like we should just do this as a generic select + custom element. There's LOTS of things we can use this for. For example, Views has a date format selector. Pick short/long/medium/etc and custom.

I'm not sure we need a double dependency?

If the overall element is dependent upon something else, an inner dependency should stay invisible properly. Trying to merge the dependencies can only lead to crying, I think.

Thanks for all the feedback. I meant to look into ctools_passthrough, was just trying to get it to work first.

Generalizing it sounds good to me.

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