Added a proper config file tokenizer that supports escaping sequences

and comments.

This allows for:

'"foo bar"' can be represented as 'foo\ bar'.

And allows for comments using the hash symbol (#), but not inside
escapes or quotes. "#this is not a comment", \#this\ is\ not\ a comment.

All configuration file parsers should be rewritten using this functionality.

GNUmakefile

@@ -163,6 +163,7 @@ libadc_common_SOURCES := \
 		src/adc/sid.c
 
 libutils_SOURCES := \
+		src/util/config_token.c \
 		src/util/ipcalc.c \
 		src/util/list.c \
 		src/util/log.c \
@@ -192,6 +193,7 @@ autotest_SOURCES := \
 		autotest/test_sid.tcc \
 		autotest/test_tiger.tcc \
 		autotest/test_timer.tcc \
+		autotest/test_tokenizer.tcc \
 		autotest/test_usermanager.tcc
 
 autotest_OBJECTS = autotest.o