Improved the animal movement

[EthanHair]

Made it so that the animals pick a new destination more often

• Shortened the max time between picking a new destination
• Changed timer.wait_time = new_wait_time to timer.start(new_wait_time). Apparently setting the wait time on a timer inside the timeout function does not take effect until the next time the timer resets. Using start() will reset it and change the wait time

Improved the unicorns

• Made it so that they stay on the outside of the map
• Made it so that a max of 2 unicorns can spawn
• Fixed some missing pixels in the spritesheet

closes #168

[EthanHair]

Also removed some print() statements

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