[TASK] Move Media cObject and CTypes to new extension

In order to separate features and also consolidate code for specific
features into one place, a new system extension is created.

The extension "mediace" ships with the core (not installed by default)
for now but could be moved to TER in future releases.

Next steps are:
- move third-party files from typo3/contrib/ to EXT:mediace
- find a proper solution to move the MediaWizard provider
- (optionally) create a Update Wizard that checks if the system uses
   media or multimedia elements or the "multimedia" and install the extension automatically.

Change-Id: I312ba6c15fece3a1319de23c085790590a659755
Resolves: #64719
Releases: master
Reviewed-on: http://review.typo3.org/36572


Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>