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/filters.c b/src/filters.c
index 592b303..965b54f 100644
--- a/src/filters.c
+++ b/src/filters.c
@@ -14,6 +14,7 @@
 #include <haproxy/buf-t.h>
 #include <common/cfgparse.h>
 #include <haproxy/errors.h>
+#include <haproxy/http_htx.h>
 #include <haproxy/htx.h>
 #include <haproxy/namespace.h>
 #include <haproxy/tools.h>
@@ -24,7 +25,6 @@
 #include <haproxy/compression.h>
 #include <proto/filters.h>
 #include <proto/flt_http_comp.h>
-#include <proto/http_htx.h>
 #include <proto/http_ana.h>
 #include <proto/stream.h>
 #include <proto/stream_interface.h>