Refactor input handling and add windowBlurred event

[ormaq]

Introduces the 'windowBlurred' event to the core event list and refactors input event handling for improved pointer, mouse, and touch management. Adds a resetInput method, uses a Set for pressed mouse buttons, ensures pointer capture/release, and streamlines event listener attachment for better reliability and maintainability.

• windowBlurred
  This is an event that is called when we tab out of the current browser tab. Useful if say we are doing something complex and want to pause the game or stop logic until the user returns.

• resetInput
  This is another feature that is more of a quality of life thing. We can at anytime remove all input currently held. Pairs nicely with windowBlurred.

I reworked the logic for mouse presses and specifically events. Before hand there was some odd logic with holding mouse 1 or 2 and pressing the other button. For example if you hold mouse 1 and tap mouse 2 we dont release mouseIsPressed. But if you hold mouse 2 then tap mouse 1 we do release!
So the logic here makes the mouse down parity p5. Where if you hold 2 mouse buttons releasing 1 causes mouseIsPressed to be false.
Also added some small touch ups.
Also updated _updateTouches to be more modern js code 😄