lib: Add uuid support to guid

[LEN] to [static LEN] on some function parameters Also add STATIC_ARRAY macro to hide it in c++ compilation.

lib: Defined array type for guid_128_t

lib: guid - centralise a 'reset to the empty value' helper function This helper just ensures that the caller never has to get the sizeof() right. (Were a guid passed as a function parameter, mistakes could happen.) Signed-off-by: Phil Carmody <phil@dovecot.fi>

lib: guid - declare some functions as pure As the functions aren't inline, the compiler can't know if they can be optimised away, so give it a helping hand. Signed-off-by: Phil Carmody <phil@dovecot.fi>

lib: guid - turn uint8_t * parameters into guid_128_t As we expose the type's internals, there's no concrete difference between the two, but it might help static code checkers to detect misuse of the library, or sloppy typing. Signed-off-by: Phil Carmody <phil@dovecot.fi>

lib: Added guid_128_copy()

Added guid_128_equals() helper function.

Added guid_128_host_hash_get().

Hash table API is now (mostly) type safe.

Moved GUID code to liblib. Use guid_128_t type consistently everywhere.