* build/: Rename directory from scripts/ and delete the obsolete
M4 macros and build files.
* codegen/: Rename directory from tools/.
* codegen/extradefs/: Rename from tools/extra_defs_gen/.
* codegen/extradefs/generate_extra_defs_clutter.cc: Rename from
tools/extra_defs_gen/generate_defs_clutter to match the name of
the executable.
* doc/: Rename directory from docs/.
* build_shared/: Delete obsolete build support files.
* autogen.sh: Replace with minimal script based on autoreconf.
* configure.ac: Rename from configure.in and rewrite for mm-common.
* Makefile.am, doc/Makefile.am, examples/Makefile.am,
clutter/src/Makefile.am, clutter/cluttermm/Makefile.am,
tests/Makefile.am: Replace with mm-common skeleton build files
adapted for cluttermm.
* codegen/Makefile.am: Replace with skeleton file adapted for
cluttermm.  Do not install convert.m4 along with the public macro
files for gmmproc.
* codegen/m4/filelist.am, clutter/src/filelist.am,
clutter/cluttermm/filelist.a...