These patches implement asn1 ber visitors for encoding and decoding data.
changed since v1:
Moved .c files into qapi directory
Moved .h files into include/qapi
Added sized buffer code
cleaned up Makefile changes to play nicer
Broke out patches for output/input visitors
New tests in tests/test-visitor-serialization.c
Fixed width integer encoding now marked with application specific bit
Removed qapi array code
Added Mike Roth's previously sent carray qapi patch
misc small cleanups
forward ported to keep up with git HEAD
added real number support
