REORG: include: split common/http.h into haproxy/http{,-t}.h

So the enums and structs were placed into http-t.h and the functions
into http.h. This revealed that several files were dependeng on http.h
but not including it, as it was silently inherited via other files.
diff --git a/include/types/http_ana.h b/include/types/http_ana.h
index 7bade13..4a1a9cd 100644
--- a/include/types/http_ana.h
+++ b/include/types/http_ana.h
@@ -23,7 +23,7 @@
 #define _TYPES_PROTO_HTTP_H
 
 #include <haproxy/api-t.h>
-#include <common/http.h>
+#include <haproxy/http-t.h>
 
 #include <types/channel.h>
 #include <types/http_htx.h>