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

[Steffen Kamper]

Hi,

i know, these constants always bring us a "religious war".
I like those and would like to have the CR, LF, CRLF and TAB globally, 
it's imho too much writing t3lib_div::CR.

I don't see a big cost having these 4 constants that make our code much 
more readable.

The specific constants could go to classes, time constants eg to 
t3lib_utility_time etc.

We have so much not used code that it's not worth fighting for 4 constants.

my 2 cts

vg Steffen