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

[Steffen Ritter]

Sigfried Arnold schrieb:
> -1 one from me.
> 
> * Should be replaced by coding guidelines for using predefined escape 
> characters (\n, \r, \t) - see PHP documentation for more info.
everyone knows about... coding guidelines should not change. it's for a 
reason.
\n is bad to read.
"" is slower than ''

so -1 to your comment