REORG: include: move activity to haproxy/

This moves types/activity.h to haproxy/activity-t.h and
proto/activity.h to haproxy/activity.h.

The macros defining the bit field values for the profiling variable
were moved to the type file to be more future-proof.
diff --git a/src/activity.c b/src/activity.c
index 0732197..c0da3e8 100644
--- a/src/activity.c
+++ b/src/activity.c
@@ -14,7 +14,7 @@
 #include <common/cfgparse.h>
 #include <common/standard.h>
 #include <haproxy/thread-t.h>
-#include <types/activity.h>
+#include <haproxy/activity-t.h>
 #include <proto/channel.h>
 #include <proto/cli.h>
 #include <haproxy/freq_ctr.h>