Many small adjustments

- Adjust header width for scrollbar presence
- Added new header assets for grass and dirt
- Adjusted styles for hosted and tracker
- Expand header to implement templating system
- Much more I have forgotten

WebHostLib/templates/pageWrapper.html

@@ -19,7 +19,7 @@
     {% if messages %}
         <div>
             {% for message in messages %}
-                <div class="alert alert-danger" role="alert">{{ message }}</div>
+                <div class="user-message">{{ message }}</div>
             {% endfor %}
         </div>
     {% endif %}