Improved logging and adjusted card's click handler

+ Logging now also works when ipcRenderer is appended to the window element.
+ Card's callback replacement method was changed from click to pointerdown.

lib/logging.js

@@ -10,7 +10,7 @@ let logHandlers = {
 }
 
 try {
-    ipc = require('electron').ipcRenderer
+    ipc = window.ipcRenderer || require('electron').ipcRenderer
     logHandlers.log = message => ipc.send('log', message)
     logHandlers.warn = message => ipc.send('warn', message)
     logHandlers.error = message => ipc.send('error', message)