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/stream_interface.c b/src/stream_interface.c
index 157fa51..02d20a0 100644
--- a/src/stream_interface.c
+++ b/src/stream_interface.c
@@ -21,6 +21,7 @@
 
 #include <haproxy/api.h>
 #include <haproxy/dynbuf.h>
+#include <haproxy/http_htx.h>
 #include <haproxy/tools.h>
 #include <haproxy/ticks.h>
 #include <haproxy/time.h>
@@ -28,7 +29,6 @@
 #include <proto/applet.h>
 #include <proto/channel.h>
 #include <proto/connection.h>
-#include <proto/http_htx.h>
 #include <proto/mux_pt.h>
 #include <haproxy/pipe.h>
 #include <proto/proxy.h>