Added basic time editing.

The button presses don't work yet as YouTube steals the events.

src/utils.ts

@@ -256,6 +256,14 @@ class Utils {
         xmlhttp.send();
     }
 
+    getFormattedMinutes(seconds: number) {
+        return Math.floor(seconds / 60);
+    }
+
+    getFormattedSeconds(seconds: number) {
+        return seconds % 60;
+    }
+
     getFormattedTime(seconds: number, precise?: boolean) {
         let minutes = Math.floor(seconds / 60);
         let secondsNum: number = seconds - minutes * 60;
@@ -275,6 +283,10 @@ class Utils {
         return formatted;
     }
 
+    getRawSeconds(minutes: number, seconds: number): number {
+        return minutes * 60 + seconds;
+    }
+
     /**
      * Is this Firefox (web-extensions)
      */