[DX] [Form] [WebProfiler] Added abbrs with type classes

This adds an <abbr> element having a descriptive title that
displays the form element's type class name.
minor #12268 [DX] [Form] [WebProfiler] Added abbrs with type classes (kix)

This PR was submitted for the master branch but it was merged into the 2.6 branch instead (closes #12268).

Discussion
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[DX] [Form] [WebProfiler] Added abbrs with type classes

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | none
| License       | MIT
| Doc PR        | none

This adds an `<abbr/>` element having a descriptive title that displays the form element's type class name. Everyone wants to know what's the type behind a form child, yes?

Looks like this:
![screenshot 2014-10-21 00 22 09](https://cloud.githubusercontent.com/assets/345754/4706604/32cf2d7a-5886-11e4-9fae-b9bff7a419ac.png)

Commits
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0d20753 [DX] [Form] [WebProfiler] Added abbrs with type classes