Wakelock and minor fixes

Minor version update to patch over a couple gaps in the bird simulations. Your presence will now alert them again, and they can get alarmed.

In addition, I’ve added an experimental ‘wake lock’ option to prevent the screen from going to sleep on Android and iOS phones, using the NoSleep.js library. Wake lock will be disabled by default, but can be toggled on and off from the options menu.

Happy birdwatching!