Updated 'core' as 'idle_loop_time' is now configurable.

Signed-off-by: Roland Haeder <roland@mxchange.org>

diff --git a/core b/core
index 925de61d0c6e97459a30df160ab88daeab74b795..3264e14858003962577ed1754b096924cbcbff21 160000 (submodule)
--- a/core
+++ b/core
@@ -1 +1 @@
-Subproject commit 925de61d0c6e97459a30df160ab88daeab74b795
+Subproject commit 3264e14858003962577ed1754b096924cbcbff21