Show Blender Foundation videos by default

* Finishes the saved torrents feature!
* Torrents load and save correctly. Poster is autogenerated only once.
* Torrents can be paused and restarted
* Download button indicates state:
 - White means paused
 - Pulsating green means downloading
 - Solid green means finished downloading, only seeding

renderer/index.css

@@ -288,6 +288,7 @@ body.drag::before {
   position: absolute;
   top: 20px;
   left: 20px;
+  width: calc(100% - 100px);
   text-shadow: rgba(0, 0, 0, 0.5) 0 0 4px;
 }
 
@@ -317,6 +318,22 @@ body.drag::before {
   padding-top: 6px;
 }
 
+.torrent .buttons .download.downloading {
+  animation-name: greenpulse;
+  animation-duration: 0.8s;
+  animation-direction: alternate;
+  animation-iteration-count: infinite;
+}
+
+@keyframes greenpulse {
+  0% { color: #ffffff }
+  100% { color: #44dd44 }
+}
+
+.torrent .buttons .download.seeding {
+  color: #44dd44;
+}
+
 .torrent .buttons .play {
   padding-top: 10px;
   background-color: #F44336;