Implement score update for Quick Draw with stopwatch

[johneastman]

When playing Quick Draw, update the score with the stopwatch.

Implementation Plan

• Make running a props in Stopwatch component
• Add score to Stopwatch props
• pass updateScore to Stopwatch props.
• Add isStopwatchRunning boolean to App component state (or maybe use isGameOver?)
• Make the Score a component and render Score or StopWatch based on current game mode.
• Remove start/stop/reset buttons from Stopwatch component and use props for starting and stopping stopwatch.