[TYPO3-dam] Rewrite of dam_ttcontent

[Torsten Schrade]

Hi,

>  Here we're
> talking about dynamically adding TCA when a BE form is rendered.

Yes, that's right. At the moment it's just a proof of concept using the 
appropriate hooks in TCEform and TCEmain.

Some further thoughts on this:

- I'd be in favour of two "on the fly" DAM fields, one for the media 
assets and one for the metadata display (a flexform).

- For EM a configuration syntax should be provided to specify for which 
tables the "on the fly" DAM fields should be included. At the moment 
I've come up with

tablename|types:typenames|after:fieldname|reffield:fieldname

Any part despite the tablename is optional, "reffield" could point to a 
"real" reference field (like dam_ttcontent) in case somebody wants to 
use this in a certain table instead of the "on the fly" versions.

In comparison to dam_ttcontent my current "on the fly" version doesn't 
provide nice img previews in BE. It just uses the standard 
txdam_getMediaTCA() function. This would be one area where more work 
needs to be done. Since I've just experimented a bit, I have to admit 
that there might be other areas (list module, field access for editors, 
versioning, workspaces etc.) that would need to be thought through first 
before the whole concept could be called promising :)

But maybe we can bring everything together to form a nice new peace of 
DAM functionality.

Cheers,
Torsten