Let's not leak details from src/shared and src/libsystemd into
src/basic, even though you can't actually do anything useful with
just forward declarations from src/shared.
The sd-forward.h header is put in src/libsystemd/sd-common as we
don't have a directory for shared internal headers for libsystemd
yet.
Let's also rename forward.h to basic-forward.h to keep things
self-explanatory.
Add macros to manage bits in a bitfield (e.g. uint32_t, uint64_t, etc),
such as setting, clearing, checking bits, and iterating all set bits.
These are similiar to the bitmap operations, but operate on basic types
instead of requiring a Bitmap object.
Yu Watanabe
Daan De Meyer
Mike Yuan
Dan Streetman