Linux OS support may have the wrong axis values

[h3rb]

While I believe I have already had input from a contributor regarding the thumbstick axis values on Linux versus Windows, there may be some residual issues noticed while working the Atari Modern Controller where values are misinterpreted. For example on Windows, it is centered at 0,0 with -1 +1 along each axis. On Linux, it registers as center 0.5,0.5 where 1 is down and 0 is up, with similar values for left/right.

See Enhancement (here) about how we should add our own profiling schema system to supplement SDLDB for known console controller mappings. We should be able to provide a way to detect and subsequently label axis on controllers we know we want to use, instead of the headache of trying to figure it out each time we make a game. For example, on the Atari Modern Controller, it uses "last axis in the list" instead of the default v/h for the right stick. We should be able to define: what is a stick, which axis does it use.