User Friendly Update

A lot of small quality-of-life improvements to make it more like a
playable game!

[ADDED]

• Optional pointer to an element (used in selection sort and quicksort)
• Swapping animation for all sorts and sorting animation for merge sort
• Persistent high score with moves-per-second tier ranking system
• Configurable simulation size and speed
• Quicksort (using Lomuto partition scheme)

[CHANGED]

• Replaced useless end screen with a view of sorted array