Added better default mapping and added basic multi-touch support

[aus4000]

Changed the default mapping to better reflect https://www.kernel.org/doc/Documentation/input/gamepad.txt (the gyro and accel mappings can't be helped though), but left the old mapping intact for compatability purposes and and is usable with --emulate-kernel from the command line.

Eventually I'll try my hand at two finger scroll, but I figured I'd submit the basic support for multi-touch in case anyone wants to beat me to it :)

[damex]

would be nice to get that.

[Ape]

I like this. Multi-touch support should be separated to another pull request. Also there are some minor white space errors that should be fixed.

@aus4000 Are you still active? Does anybody else want to continue from this?