settings: Add option to toggle Error Reporting.

Adds an option to enable or disable sentry error
reporting under Advanced section in General Settings. 
Handles both main and renderer processes.

Also, changes the domain used to resolve proxy
in proxy-util from google.com to example.com.

Fixes #702.

app/renderer/js/utils/logger-util.js

@@ -6,10 +6,23 @@ const { initSetUp } = require('./default-util');
 const { sentryInit, captureException } = require('./sentry-util');
 
 initSetUp();
-sentryInit();
+
 let app = null;
+let reportErrors = true;
 if (process.type === 'renderer') {
 	app = require('electron').remote.app;
+
+	// Report Errors to Sentry only if it is enabled in settings
+	// Gets the value of reportErrors from config-util for renderer process
+	// For main process, sentryInit() is handled in index.js
+	const { ipcRenderer } = require('electron');
+	ipcRenderer.send('error-reporting');
+	ipcRenderer.on('error-reporting-val', (event, errorReporting) => {
+		reportErrors = errorReporting;
+		if (reportErrors) {
+			sentryInit();
+		}
+	});
 } else {
 	app = require('electron').app;
 }
@@ -94,7 +107,9 @@ class Logger {
 	}
 
 	reportSentry(err) {
-		captureException(err);
+		if (reportErrors) {
+			captureException(err);
+		}
 	}
 
 	trimLog(file) {