1. implement cryptpadCache which has put() and get() functions that can be used like a localStorage that auto-flushes when a new version is released

2. change loading.js to use packaged css in order to get the loading screen up as quick as possible.
3. change LessLoader to cache less in cryptpadCache

www/common/sframe-protocol.js

@@ -127,4 +127,7 @@ define({
     // Present mode URL
     'Q_PRESENT_URL_GET_VALUE': true,
     'EV_PRESENT_URL_SET_VALUE': true,
+
+    // Put one or more entries to the cache which will go in localStorage.
+    'EV_CACHE_PUT': true,
 });