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/flt_trace.c b/src/flt_trace.c
index 64dc564..362040c 100644
--- a/src/flt_trace.c
+++ b/src/flt_trace.c
@@ -13,6 +13,7 @@
 #include <ctype.h>
 
 #include <haproxy/api.h>
+#include <haproxy/http_htx.h>
 #include <haproxy/htx.h>
 #include <haproxy/tools.h>
 #include <haproxy/time.h>
@@ -24,7 +25,6 @@
 #include <types/stream.h>
 
 #include <proto/filters.h>
-#include <proto/http_htx.h>
 #include <proto/log.h>
 #include <proto/http_ana.h>
 #include <proto/stream.h>