[TYPO3-core] RFC #12066: Code cleanup: Add some constants

[Benjamin Mack]

Hey Oli,

so, I see you have enough +1s, so it's ready to commit.

Please update your patch (once more, sorry):

  * One patch with the actual constants *in* config_default.php (no 
require_once, as this would slow down the pagegeneration as well)

  * One patch with the tests,

  * and one patch with all the replacements.

I will take care of the commit then.

All the best,
Benni.