Update core

Signed-off-by: Florent Bruneau <florent.bruneau@polytechnique.org>

diff --git a/core b/core
index 23947d1..cab6c1c 160000 (submodule)
--- a/core
+++ b/core
@@ -1 +1 @@
-Subproject commit 23947d18803b48cc6c235cdd3c304ca52fd6763c
+Subproject commit cab6c1c15dfa75c04b433447e608edb59171c376