[TYPO3-hci] Combine page and list module into one module

[Tapio Markula]

Andreas Balzer
> Possible solution:
> 1) Restrict users to create content elements for pages inside page 
> elements. Do not allow users to create content elements for pages inside 
> sysfolders.
> 2) Restict users to create elements for extensions within sysfolders. Do 
> not allow users to create elements for extensions within page elements.
> 3) Remove the functionality of the list module to create standard 
> content elements. Only allow the list module to create elements for 
> extensions.

Note that the problem concerns primarily just templavoila because 
content elements added for the classic page module would work ok in 
frontend. Just needed to add some configuration to restrict creating 
content elements using the list module.

> 4) Combine the page and the list module. 
too complex view for avarage user