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

The files were moved almost as-is, just dropping arg-t and auth-t from
acl-t but keeping arg-t in acl.h. It was useful to revisit the call places
since a handful of files used to continue to include acl.h while they did
not need it at all. Struct stream was only made a forward declaration
since not otherwise needed.
diff --git a/src/frontend.c b/src/frontend.c
index 050a08f..068e8d6 100644
--- a/src/frontend.c
+++ b/src/frontend.c
@@ -22,6 +22,7 @@
 
 #include <netinet/tcp.h>
 
+#include <haproxy/acl.h>
 #include <haproxy/api.h>
 #include <haproxy/chunk.h>
 #include <haproxy/frontend.h>
@@ -32,7 +33,6 @@
 
 #include <haproxy/global.h>
 
-#include <proto/acl.h>
 #include <haproxy/arg.h>
 #include <proto/channel.h>
 #include <haproxy/fd.h>