Split core/include.am into per-subdirectory include.am files

changes/ticket32137

scripts/maint/add_c_file.py

src/app/config/include.am

src/app/main/include.am

src/core/crypto/include.am

src/core/include.am

src/core/mainloop/include.am

src/core/or/include.am

src/core/proto/include.am

src/feature/api/include.am

src/feature/client/include.am

src/feature/control/include.am

src/feature/dirauth/include.am

src/feature/dircache/include.am

src/feature/dirclient/include.am

src/feature/dircommon/include.am

src/feature/dirparse/include.am

src/feature/hibernate/include.am

src/feature/hs/include.am

src/feature/hs_common/include.am