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/fcgi-app.c b/src/fcgi-app.c
index 0db8e79..dda4b3a 100644
--- a/src/fcgi-app.c
+++ b/src/fcgi-app.c
@@ -10,6 +10,7 @@
  *
  */
 
+#include <haproxy/acl.h>
 #include <haproxy/api.h>
 #include <haproxy/chunk.h>
 #include <common/cfgparse.h>
@@ -23,7 +24,6 @@
 
 #include <haproxy/global.h>
 
-#include <proto/acl.h>
 #include <proto/fcgi-app.h>
 #include <proto/filters.h>
 #include <proto/log.h>