Function stperf::get_formatted_string

pub fn get_formatted_string(ops: FormattingOptions, decimals: usize) -> String

Returns what print prints, if you want to put it somewhere else than stdout.

Which is something like this:

╶──┬╼ main                        - 100.0%, 300 ms/loop
   ├──┬╼ physics simulation       -  66.7%, 200 ms/loop
   │  ├───╼ moving things         -  50.0%, 100 ms/loop
   │  └───╼ resolving collisions  -  50.0%, 100 ms/loop
   └───╼ rendering                -  33.3%, 100 ms/loop