QoL changes on tracker

- Remove redundant checks and returns
- Add an additional check for local storage (some browsers still lack it)
- Using some better practices
- Use MutationObserver for events
- Add initial events on DOM full render, send first trackView on complete readyState

lib/web.js

@@ -44,17 +44,14 @@ export const hook = (_this, method, callback) => {
 export const doNotTrack = () => {
   const { doNotTrack, navigator, external } = window;
 
+  const msTrackProtection = 'msTrackingProtectionEnabled';
   const msTracking = () => {
-    return (
-      external &&
-      typeof external.msTrackingProtectionEnabled === 'function' &&
-      external.msTrackingProtectionEnabled()
-    );
+    return external && msTrackProtection in external && external[msTrackProtection]();
   };
 
   const dnt = doNotTrack || navigator.doNotTrack || navigator.msDoNotTrack || msTracking();
 
-  return dnt === true || dnt === 1 || dnt === 'yes' || dnt === '1';
+  return dnt == '1' || dnt === 'yes';
 };
 
 export const setItem = (key, data, session) => {