Add a .25 increment in CPU timer speed

[palop4l]

Your suggestion

CPU timer speed is great, changing animation speed only and leaves out audio. I can see this have potential to benefit some games greatly particularly ones that felt slow to play. But the difference between 1x and 2x is too much(depend on games it can be ok if you want some challenge) so if it's possible please add .25 increment (1.25, 1.5, 1.75, ....) to CPU timer speed and that would be perfect. Thank you very much CEMU team!!!