[TYPO3-core] RFC #17673: Remove old caching and enable caching framework by default

[Christian Kuhn]

This is an SVN patch request

Type: feature

Branches: trunk

BT: http://bugs.typo3.org/view.php?id=17673

Problem:
The caching framework matured and is a requirement for a broader 
refactoring of TYPO3 bootstrapping.

Solution:
Enable it by default and remove old caching.

Notes:
- Patches for workspace, dbal and extbase are separated.
- constant TYPO3_UseCachingFramework is defined to be always TRUE for 
backwards compatibility
- Setting useCachingFramework is deprecated in config_default
- Setting pageCacheToExternalFiles (whatever this undocumented feature 
was used for) is deprecated in config_default
- tables cache_pages, cache_pagesection and cach_hash are removed

Regards
Christian
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