Allow an increase/decrease width/height shortcut, not just size of whole window.

[gregoryorton-ws]

Depending on the size and aspect ratio of the current window, it's not always desirable to scale both width and height in a linear fashion. It might be desired that you want to adjust the height or the width only. For example moving to a new monitor, or a particularly long document.

Idea:

• allow individual width/height increase/decrease commands
• allow specifying a interval in pixels or percent for this command

Thanks!

[rxhanson]

Smaller/Larger width is available:
https://github.com/rxhanson/Rectangle/blob/main/TerminalCommands.md#make-smallermake-larger-width-only

I also would be up for merging a PR to add Smaller/Larger height in the same way.