hst/instance: define instance state

This is now part of the hst API. This change also improves identifier generation and serialisation.

Signed-off-by: Ophestra <cat@gensokyo.uk>

cmd/hakurei/parse.go

@@ -61,7 +61,7 @@ func tryFd(msg message.Msg, name string) io.ReadCloser {
 	}
 }
 
-func tryShort(msg message.Msg, name string) (config *hst.Config, entry *state.State) {
+func tryShort(msg message.Msg, name string) (config *hst.Config, entry *hst.State) {
 	likePrefix := false
 	if len(name) <= 32 {
 		likePrefix = true