Static import, common seqs array

Added a static import for KeyEvent to reduce code clutter.
Added some final int[]s for common key sequences.

At first, before my static import, I had an array of common keys like
int UP = KeyEvent.VK_UP, A = KeyEvent.VK_A, etc. but I scratched that
out because if you're going to have to use VK_ for some you might as
well leave it consistent and I didn't want to copy every single static
member from KeyEvent. Maybe there's a way with reflection to have all
the KeyEvents usable without VK_ in front. It would make code look a lot
nicer if the VK_'s disappeared.