Update core

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

diff --git a/core b/core
index ca6384f..c760845 160000 (submodule)
--- a/core
+++ b/core
@@ -1 +1 @@
-Subproject commit ca6384fb36992e0899efea20ea1082bfc77d7c41
+Subproject commit c7608455a9cf70be96815fc0e94e864572c7336d