Gamepad API for Controller Support

[james-ralph8555]

Hi! I've added controller support to lainTSX.

It uses the browser gamepad api to allow the user to play the game with a connected controller. For the control mapping, I've based the default mapping on the original PS1 manual.

I've also defined two alternate control schemes. I've added a tab in the options menu for setup:

A demo is available here: https://dmttdhl4kc2zt.cloudfront.net/game.html
note: I didn't have all of the sounds, and you have to navigate to /game.html instead of /game, but this doesn't reflect any changes I've done in code, just how the hosting works.

My fork: https://github.com/james-ralph8555/lainTSX

I've tested on chrome/firefox.
I've only tested with a PS3 controller, and don't own a bluetooth / xbox controller to test with.

Let me know if you have any feedback or if you’d like me to open a PR.

[ad044]

hey, will be able to take a look at this hopefully in the near future, in the meanwhile you could make the following changes:

1. use snake_case instead of camelCase to be consistent with the rest of the codebase
2. remove any changes to styles.css
3. overall the code formatting should not change at all - modal.js indentation is different in your fork, ideally the diff should only include new code, at least for the most part
4. some of the comments are redundant, some examples:

// 1.
// Handle analog triggers
this.handleAnalogTriggers(gamepad, keyStates, i, currentTime);

// 2.
// Update gamepad states before engine update
gamepadManager.update(engine.key_states);
        
engine.update(current_time, delta);

etc.

thank you!