Now that printbuffer is used for everything, it's not needed anymore.

Always print with printbuffer

Add tests for print functions

partial build system integration of the afl fuzzing tool

This is achieved by encoding the type of function used in the first two
bytes.

First byte:
b: buffered

Second byte:
f: formatted

With one big limitation: It can only be fuzzed with what has been
parsed by the library beforehand.

ensure improvements

We don't need to copy the entire printbuffer, only the part that is
used.

This allowed for the removal of a lot of if (p) checks.

Simplify parsing