Add pitch smoothing #715

Job	Run time
clippy - Ubuntu	38s
stable - Ubuntu - debug	1m 35s
rustfmt	11s
clippy - Windows	1m 12s
stable - Debian (cross to Windows) - debug	1m 8s
stable - Ubuntu - release	1m 26s
stable - Debian (cross to Windows) - release	1m 11s
beta - Ubuntu - debug	1m 47s
beta - Debian (cross to Windows) - debug	1m 7s
stable - Windows - debug	2m 14s
stable - Windows - release	2m 51s
beta - Windows - debug	2m 5s
Publish Wiki	0s
	17m 25s

Provide feedback