Moved render-slots to messages.cl, removed non-1.0 entity-headers,
and implemented the rest. Added a number of ready-made entity
implementations, for use with static-resource.
nearly all concepts and simple implementations thereof needed to get a
simple HTTP/0.9 "compliant" server working (there are some hacks
needed that we don't yet provide, since the correct things will be
added shortly, like complete HTTP/1.1 request parsing. The hacks
needed are provided as part of the basic HTTP/0.9 server demo in
src/test/basic-demo.cl).
Further work is needed to clean up some things, Entity and Resource
handling needs to be implemented right and less "naive" (the current
implementations are just simple place-holders to get things up and
running). Connections need to have knowledge of client identity
(passed from the driver, this is implementation-specific stuff).
Logging needs to be implemented (probably as server mixins).
Condition handling needs to generate better responses for HTTP/0.9,
and the division between condition handling and normal handling needs
to be documented/rethought. Content generation is totally missing
currently and needs to be implemented. If this is all in place, an
HTTP/1.0 conforming server should be possible, and after porting the
drivers to ACL and LW, we can make a first release.
