Modernize.
Split .gitignore into subdirs.
Split top-level Makefile.am into subdirs.
Merge in two makeann.c into one and hook it up to the build.
Add file required by the new autoconf.
Re-gen.
Move stand-alone makefiles out of the way.
Move rtpproxy srcs into its own subdir. It's getting too big to
keep everything at the top level.
Re-gen.