added basic subscriptions support for playlists and channels

update youtube-dl binary on windows

updated favicon to the new icon

src/app/subscriptions/subscriptions.component.scss

@@ -0,0 +1,27 @@
+.add-subscription-button {
+    position: fixed;
+    bottom: 30px;
+    right: 30px;
+}
+
+.subscription-card {
+    height: 200px;
+    width: 300px;
+}
+
+.content-loading-div {
+    position: absolute;
+    width: 200px;
+    height: 50px;
+    bottom: -18px;
+}
+
+.a-list-item {
+    height: 48px;
+    padding-top: 12px !important;
+}
+
+.sub-nav-list {
+    margin: 0 auto;
+    width: 80%;
+}