Simplify how configuration is read, allowing arbitrary states to trigger arbitrary responses

Allows one handler to encompass what the Dash SHM and Dash Home Assistant integrations required.

Breaking change, though, as configuration variables change

index.js

@@ -92,14 +92,11 @@ function buttonActivated( mac ) {
         var service  = 'services/',
             postBody = {};
 
-        if ( 'off' === body.state ) {
-            service            += buttonConfig.on.entity + '/' + buttonConfig.on.entity_action;
-            postBody.entity_id = buttonConfig.on.entity_id;
-        } else if ( 'on' === body.state ) {
-            service            += buttonConfig.off.entity + '/' + buttonConfig.off.entity_action;
-            postBody.entity_id = buttonConfig.off.entity_id;
+        if ( 'object' === typeof buttonConfig[ body.state ] ) {
+            service            += buttonConfig[ body.state ].entity + '/' + buttonConfig[ body.state ].entity_action;
+            postBody.entity_id  = buttonConfig[ body.state ].entity_id;
         } else {
-            console.error( 'Unknown state: ' + body.state );
+            console.error( 'Unhandled state: ' + body.state );
             return;
         }