Throttle by coretiming event instead of VI

VI isn't called as regular as we want to, so we have to create a new throttling event called regularly by coretiming.

Atm we throttle every 1 ms when we are too fast and skip throttling when we lack 40ms (to avoid fast boosts after slowdowns)
Drop framelimit by fps

Framelimit by fps can't be done per coretiming
Use float to calculate the fps/vps

This will round internally, so 59.99 fps will now be shown as 60 fps.
Merge pull request #44 from degasus/throttling

CPU Throttling by CoreTiming