Auto tuning, Keyboard shortcuts, Roundsivepercent

- Initial Auto tuning related to L1,L2 cache size. It takes about 4 min
after the minder was started.
- Keyboard shortcuts for change parameters at runtime
- Round sieve percentage - Similar feature that was introduced in
mikaelh's hp8 primecoin client. Sets how much time is spent in the sieve
(Wave) and how much time is spent on checking the candidates produced by
the sieve.
- New VS project configuration for /arch:AVX compilation flag