This change adds a test suite for validating mouse configuration. This
only tests the logic for mouse thread enable/disable and mouse speed
calculations.
Prior to this change, the virtual mouse update was restricted to
updating once every `mouse_delay` microseconds, and the allowed values
were a small fixed set. Some users reported that even at the highest
speed, the speed was slower than they were used to (with a high DPI
mouse).
This change modifies the speed calculation algorithm as follows. It
keeps the slowest speed to refresh the mouse every 70 ms. As the speed
increases, the refresh rate drops by 5 ms for every increment in speed,
until the refresh rate caps at once every 10 ms. Beyond that, a
multiplicative factor begins to take effect, with each speed increase
adding 0.25 to the factor. That is, speed 13 would multiply the axis
components by 1.25 _and_ refresh every 10 ms. Speed 14 would bump the
factor to 1.50, speed 15 to 1.75, and so on, until the factor tops out
at 6.0.
Prior to this change, the mouse delays were between 50 ms to 250 ms,
with a difference of 50 ms between steps. Unfortunately, this was too
slow at lower speeds, therefore, the delays have been changed to vary
from 30 ms to 70 ms with a difference of 10 ms between steps. This gives
a much smoother mouse response.
Prior to this change, the build would fail on macOS systems because the
evdev sources were only included on Linux systems, and macOS does not
have evdev/libevdev. By separating out the configuration and update
threads, this should build on macOS, but the configuration would be
ignored.
nirenjan