Feature: Numeric input

[rojepp]

Just a feature suggestion, similar to the clock input, just a dialog with a keypad to enter a number like a quantity.
Could have settings for min&max allowed number, and maybe plus/minus buttons.

[maxkeppeler]

I worked on it, but it probably won't be included in the next release. Instead, it will be part of a future release, such as 1.4. I'm still considering how it should function, appear, and behave. I also think it would be great to incorporate basic input calculation, so it's still WIP.