Allow idle monitor to be disabled

WHATSNEW.md

@@ -27,6 +27,7 @@ This document attempts to track **major** changes and additions in ENiGMA½. For
     ]
 }
 ```
+* `idleLogoutSeconds` and `preAuthIdleLogoutSeconds` can now be set to `0` to fully disable the idle monitor.
 
 ## 0.0.9-alpha
 * Development is now against Node.js 10.x LTS. While other Node.js series may continue to work, you're own your own and YMMV!

core/client.js

@@ -476,7 +476,7 @@ Client.prototype.startIdleMonitor = function() {
         //  use override value if set
         idleLogoutSeconds = this.idleLogoutSecondsOverride || idleLogoutSeconds;
 
-        if(nowMs - this.lastKeyPressMs >= (idleLogoutSeconds * 1000)) {
+        if(idleLogoutSeconds > 0 && (nowMs - this.lastKeyPressMs >= (idleLogoutSeconds * 1000))) {
             this.emit('idle timeout');
         }
     }, 1000 * 60);