[TYPO3-core] make the tree collapsable

[Michael Stucki]

Hi Steffen,

> there are a lot of issues that has to be fixed without t3skin.
> I must say that i use it all the time.

If only half of all features work without the skin, then we don't need the
separation anymore! Then we can directly move t3skin into the base
directory and remove this feature.

> I also stumbled about some issues like in t3skin are stylesheets defined
> which don't exist in orig. skin, so some changes went there.
> As t3skin is installed by default, most users will use it, but some
> "long-time-users" prefer original one.
> 
> I can offter do a session with ben in the next days to go through
> css-issues in old skin.

Yes, please!

- michael
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