Case sensitivity

[doubleactii]

Certain API can only be referenced via upper case.

ControllerInstance.isButtonPressed('A');
ControllerInstance.isButtonPressed('a');

Will return different results. The first API call is the valid one. Whereas the second one will always return the wrong result.

There should also be a standard on which casing is preferred in the module.

In the following API upper case is seen to be a preference as pButtonName is passed down in upper case, but it is not really concreted as the preference anywhere else.

GamepadManager.on('connect', function(pController) {
    pController.on('press', (pButtonName, pValue, pRepeat) => {
    });
});

Find a preferred casing and make the module use that casing throughout the module.
Allow different casing to be resolved in the internals of the module.

So that

ControllerInstance.isButtonPressed('a');

will internally be the same as

ControllerInstance.isButtonPressed('A');