A new input driver (test_input), similar to test joypad driver.
Takes its inputs from a json file provided in options. Supports
keyboard input and sensor input (accelerometer, gyroscope,
illuminance).
Remote Retropad extended with a sensor test screen.
* Test driver for joypad inputs
Add a new joypad input driver:
- hide driver behind #ifdef and enable it in config_params.sh
- add a new config parameter to specify the test input file
- add aux files: additional config files that cancel out any binds
that may be present in RA config, autoconfig profile for
test joypads, test input file that matches controller test
sequence
* Fixes and comments for test input driver.
