REORG: include: move http_htx.h to haproxy/http_htx{,-t}.h

A few includes had to be added, namely list-t.h in the type file and
types/proxy.h in the proto file. actions.h was including http-htx.h
but didn't need it so it was dropped.
diff --git a/src/http_fetch.c b/src/http_fetch.c
index f21d77c..42ba8c2 100644
--- a/src/http_fetch.c
+++ b/src/http_fetch.c
@@ -22,6 +22,7 @@
 #include <haproxy/h1.h>
 #include <haproxy/h1_htx.h>
 #include <haproxy/http.h>
+#include <haproxy/http_htx.h>
 #include <haproxy/htx.h>
 #include <haproxy/pool.h>
 #include <haproxy/tools.h>
@@ -34,7 +35,6 @@
 #include <proto/channel.h>
 #include <proto/connection.h>
 #include <proto/http_fetch.h>
-#include <proto/http_htx.h>
 #include <proto/log.h>
 #include <proto/obj_type.h>
 #include <proto/http_ana.h>