Added 'concice' option

[tomasz13nocon]

Specifying -m option or clicking m on a keyboard during execution
gets rid of all unused space and makes the clock be as close to top left corner as possible.
Useful if you want to have the clock in the smallest terminal space possible.

Works (doesn't break) with border/box functionality (Enabling box negates this feature).

Without the option (red marks unused space):

With the option:

[anarcat]

conflicts would need to be fixed here. there's also a bug report about this in #62 - could we make this more generic and just allow users to pick the margin?

[tomasz13nocon]

As the year of the rabbit is upon us I thought what better way to celebrate and reflect on the past than to revive this 5 year old PR.

I saw no reason to allow to specify the margin since there's now a way to move the clock around.

Hope this gets merged within the next 5 years 🥺