dev: start parser refactor on the main codebase, see #65 and #44

Things were getting a bit complicated and slow with the old parser so I decided to continue #44's work on the main codebase.

lib/parser/contents/classes/Endscreen.js

@@ -0,0 +1,14 @@
+'use strict';
+
+const Parser = require('..');
+
+class Endscreen {
+  type = 'endscreenRenderer';
+  
+  constructor(data) {
+    this.elements = Parser.parse(data.elements);
+    this.start_ms = data.startMs;
+  }
+}
+
+module.exports = Endscreen;