Make bbus_hdr_setpsize and bbus_hdr_getpsize use size_t instead of uint16_t.
Remove the name argument from method callbacks.
Update TODO.
Don't require bufsize in __bbus_prot_sendmsg.
Don't require msgsize in bbus_prot_extractobj and bbus_prot_extractmeta.
Remove unneeded size parameters from various functions + some other tweaks.