Make 4.0.0 releasev4.0.0

Includes a small API behavior change, hence the major version bump:

 - db63301 ("Return "" for unwritten symbols in Symbol.config_string")

New features:

 - Support for incremental builds using the same scheme as the
   include/config/ directory in the C tools. See the new
   Kconfig.sync_deps() function and commit 378dedc ("Add support for
   incremental builds").

 - Minimal configuration (defconfig) writing, generating identical files
   to the C implementation. See commit 652f11b ("Add minimal
   configuration file generation support").

   The C 'make savedefconfig' implementation is currently broken in
   obscure cases involving tristate choices (due to broken invalidation
   code), so the tests are disabled for now. I have a patch for the C
   implementation that I will submit.

Fixes:

 - user_value wasn't set for choice symbols set to y via load_config()
   with replace=True. Fixed by commit 0bd841d ("Properly remember y user
   values for choice symbols"). Didn't affect correctness, only the API.

Other changes:

 - 778ec47 ("Only write '# CONFIG_FOO is not set' for visible symbols")
   mirrors a change I made to the C tools.

 - bbe3ae9 ("Do not write the defconfig_list symbol to .config") mirrors
   another change made to the C tools.

 - Misc. refactoring and cleanup.

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