* Filter axes 2/5 for all devices, but only if LeftTrigger or RightTrigger is being configured. This should fix compatibility with XBox 360 and other generic controllers that use these axes for triggers, but won't affect other controllers using these axes for analog sticks, etc.
* Improve third-party PS3 detection (some Shanwan controllers have a grave accent in place of 'm' for 'Gamepad').
The hid-sony driver has both analog and digital buttons for the triggers,
and the analog values range from -32767 to 32767, which can cause two unwanted
input events (digital button and negative axis) per press.
Implement a function to filter out unwanted input events during configuration,
but isolate detection to known PS3 controllers with 6 axes so that older versions
of hid-sony and the sixad driver (which use 25+ axes) are not impacted negatively.
