Updated 'core' (checks on startup and interval delays added).

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

diff --git a/core b/core
index 15bab1114f3d4e33c67d035a7d3c20a8babeee81..925de61d0c6e97459a30df160ab88daeab74b795 160000 (submodule)
--- a/core
+++ b/core
@@ -1 +1 @@
-Subproject commit 15bab1114f3d4e33c67d035a7d3c20a8babeee81
+Subproject commit 925de61d0c6e97459a30df160ab88daeab74b795