1.42.50 - Audio latency, mtrr, scheduler

[villemt]

Below millisecond audio latency (intelhda,audio.asm)
- 0.083 msec @ 192 khz, 24 bit (playback)
- 0.667 msec @ 48 khz, 16 bit (record)
Upto 100 khz scheduler (config.mnt, syscalls 241,203,223)
Audio syscalls for time critical process (syscall 240)
Improved MTRR graphics acceleration (config.mnt)