added sound notifications (used in mail for now) and more settings UI work

static-data/www/mail/loadsettings.js

@@ -0,0 +1,14 @@
+mailSettings = {}
+
+fetch('/config/get/mail', {
+    headers: {
+      "content-type": "application/json",
+      "token": webpass
+    }})
+.then((resp) => resp.json())
+.then(function(settings) {
+    mailSettings = settings || {}
+    if (mailSettings.default_forward_secrecy === false){
+        document.getElementById('forwardSecrecySetting').checked = false
+    }
+  })