Low-battery alert for Wiimotes

Initial support for Wii Remote battery handling in-emulation, as well as improved LED handling that combines number space across controller types.
Merge pull request #554 from dethbunny/BatteryHandling

Low-battery alert for Wiimotes
Nestopia: set favored machine state to NTSC
Updated app version to 1.0.0b10
Updates helper application version to 1.0.0b10.
Disable audio output device menu in HUD
Replace minimum/value/maximum integral values for axis and trigger events and replace them with scaled value from -1 to 1. Merge axis and trigger backing store.
Upstream