util_libs: remove autoconf.h from util_libs

this commit removes autoconf.h generation from each lib and
append '#include <<lib_name>/gen_config.h>' after each
'#include <autoconf.h>' since autoconf.h is only the for the
kernel config now. This is a temporarily solution, since we
currently don't have a way to tell which header files each file
is trying to include when it includes 'autoconf.h'

libutils: Make the default ZF_LOG_LEVEL configurable in both build systems

libutils: move zf_log macros from libsel4utils

fix licenses

libutils: Add compile zf_log compiler warning

utils: Added memory fence macro

utils: Headers included in alphabetical order

libutils: Add functionality for forcing an undefined instruction.

See source code comments for the purpose of this.

Revert "libutils: Add functionality for printing JSON."

This reverts commit afa8fe48022ae1cc71ad9d589a460123148947d3.
Please use projects_libs/libjansson instead, which is a
more complete JSON parsing and encoding library for c.

libutils: trivial: Replace ifdef guards with pragma once.

libutils: Add support for auto-freed pointers.

libutils: Added frequency.h to libutils

This defines some macros for converting between frequency, time and
cycles, some frequency unit conversions, and a typedef for freq_t.

libutils: Including force.h from util.h

libutils: Implementation of config_set

An implementation of a config_set macro for checking if a Kconfig
style configuration variable is set or not from regular C 'if'
statements

libutils: Implementation of config_set

An implementation of a config_set macro for checking if a Kconfig
style configuration variable is set or not from regular C 'if'
statements

libutils: Add functionality for printing JSON.

This commit is essentially an import and clean up of
https://github.inside.nicta.com.au/mfernandez/libjson.

libutils: Add a function for printing escaped XML data.

libutils: Add support for generic variable printing.

libutils: remove TRUE and FALSE, use stdbool instead

Default ZF_LOG_LEVEL to ERROR, DEBUG should be turned on per file when debugging

libutils: remove unused header