move String class initialization to method

[maul-esel]

Doing so has two advantages:

• the user can not be surprised by behaviour he did not explictly enable
• #includes outside the auto-execute section still work

[lordkrandel]

Good idea, I just implemented this in a different way in LIB_CORE

[maul-esel]

Didn't test yet, but I can't imagine this to do the same thing?! Did you look at my code?

[lordkrandel]

hrm... I've left things unfinished and something got broken. Have a look at the latest commits anyway.