* partially fix clang compilation

Missing header and mistaken algorithm usage.

Also removed it name from range loops. It's not correct.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

* run through clang's -Wrange-loop-analysis

Some range loops should not use references as they need to copy.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

* manual range loop conversions

Signed-off-by: Rosen Penev <rosenp@gmail.com>