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

Just a minor change, moved the macro definitions upwards. A few caller
files were updated since they didn't need to include it.
diff --git a/src/proxy.c b/src/proxy.c
index 803f186..78d91e6 100644
--- a/src/proxy.c
+++ b/src/proxy.c
@@ -22,6 +22,7 @@
 #include <common/cfgparse.h>
 #include <haproxy/cli.h>
 #include <haproxy/errors.h>
+#include <haproxy/filters.h>
 #include <haproxy/global.h>
 #include <haproxy/http_ana.h>
 #include <haproxy/listener.h>
@@ -40,7 +41,6 @@
 
 #include <proto/backend.h>
 #include <haproxy/fd.h>
-#include <proto/filters.h>
 #include <proto/log.h>
 #include <haproxy/proto_tcp.h>
 #include <proto/proxy.h>