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

The stktable_types[] array declaration was moved to the main file as
it had nothing to do in the types. A few declarations were reordered
in the types file so that defines were before the structs. Thread-t
was added since there are a few __decl_thread(). The loss of peers.h
revealed that cfgparse-listen needed it.
diff --git a/src/peers.c b/src/peers.c
index 8ffe421..45e438d 100644
--- a/src/peers.c
+++ b/src/peers.c
@@ -43,7 +43,7 @@
 #include <proto/proxy.h>
 #include <proto/session.h>
 #include <proto/stream.h>
-#include <proto/stick_table.h>
+#include <haproxy/stick_table.h>
 #include <proto/stream_interface.h>