Add manual function definition in `mon`
Add manual function definition in `mon`

Name is ordered list of inputs, combined with underscores.

E.g., in `~/.config/mon`:

```
eDP1_DP2_HDMI1=(
  xrandr
    --output eDP1 --primary --mode 1920x1080
    --output HDMI1 --above eDP1 --mode 1920x1080
    --output DP2 --right-of HDMI1 --mode 1920x1080
    --dpi 100
)
```

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