Added support for custom quality settings for video and audio files.

Available formats are downloaded when a valid YT url is detected. These formats are then parsed and a best audio format is selected based on the results

After downloading a file with no file manager, file is now deleted. After file deletion, mp3/mp4 reload occurs

Updated view on main component to be more responsive, using bootstrap grid

Updated progress bar UI-wise to be more in line with the rest of the page

src/app/main/main.component.css

@@ -36,6 +36,10 @@ mat-toolbar.top {
     width: 100%;
 }
 
+.example-80-width {
+    width: 80%
+}
+
 mat-form-field.mat-form-field {
     font-size: 24px;
   }
@@ -65,4 +69,16 @@ mat-form-field.mat-form-field {
     position: absolute;
     right: -10px;
     top: 5px;
+}
+
+.spinner-div {
+    display: inline-block;
+    position: absolute;
+    top: 15px;
+    right: -40px;
+}
+
+.margined {
+    margin-left: 20px;
+    margin-right: 20px;
 }