all: add missing copyright notices

Signed-off-by: Sam Whited <sam@samwhited.com>

all: allow encoding structs from within handlers

Revert "all: pass Session directly to handler"

This reverts commit 7e76defde884af7cd63b3d6bb7065694db076b8f.

all: pass Session directly to handler

xmpp: add regression test for HandlerFunc

xmpp: remove mux in favor of a middleware like API

xmpp: add experimental ServeMux API