state sync, many changes:

* separated css/js/rule files to pak file (glorified zip) to reduce full rebuilds
* implemented build cache
* some frontend UI spiffing up

app/templates/main_page.j2

@@ -49,7 +49,14 @@
 </div>
 
 <div id="main-content">
-    <div id="main-day-stats">It has been <span id="main-day-counter">a cosmically unknowable number of</span> days.</div>
+    <div id="main-header">
+        <div id="main-day-stats">It has been <span id="main-day-counter">a cosmically unknowable number of</span> days.</div>
+        <div id="main-button-bar">
+            <button id="button-charsheet" class="main-bar">📊</button>
+            <button id="button-settings" class="main-bar">⚙️</button>
+            <button id="button-about" class="main-bar">ℹ️</button>
+        </div>
+    </div>
     <div id="main-log"></div>
 </div>