Set ADC range/accuracy of joysticks/axis.

**Is your feature request related to a problem? Please describe.**
The issue is that the library is coded for -127/128 int value, 8bit. While many SoC's have 12bit ADCs or better. (I'm using an ESPS2 at the moment)

**Describe the solution you'd like**
An easy and clear way to change the settings of these values for the gamepad portion of the library.

**Describe alternatives you've considered**
Editing the library itself to use int_12t instead of the currently used int_8t.

**Additional context**
Joysticks and triggers for gamepads usually don't need more than 256 values for most casual games, but depending on the game (like simracing, or a shooter) having more accuracy can be the difference between having an enjoyable time, or not being able to pinpoint *why* the controller feels bad to play on but knowing you're not at fault.

Start by tracing the gamepad axis and trigger value definitions in the library and compare their current 8-bit range with the requested configurable ADC range. Done means the gamepad portion provides a clear way to select higher-resolution axis values without requiring users to edit the library itself.

Written by the indexing model from the issue text.