mntime 0.3.0

Execute "m" commands "n" times to calculate mean of usage time and memory. As an alternative to "time", "gnu-time" is used internally.
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# Design of mntime

## Sequence Diagram

```mermaid
sequenceDiagram
participant main as main thread
participant app as app thread
participant cmd as cmd thread
participant view as view thread

main-)+app: run
main-)+view: spawn
main-)+main: poll keys
    loop m for each command
    app-)view: draw command title
    loop n for try count
    app-)view: draw progress
    app-)+cmd: execute `sh -c time command`
        cmd--)-app: return output
    end
    app-)view: draw command result
    end
main-)app: (quit if there is a 'q' key interrupt)
    app--)-main: return status
main -x view: quit
deactivate view
main->>-main: exit status
```