Result direction spacing

[marc24force]

I have added two new configuration options result-vert-spacing and result-hori-spacing which behave like result-spacing but for the whole results and in the two dimensions. This change requires that if result-spacing was set, result-vert-spacing (or result-hori-spacing if horizontal=true) is set to the same value so the first element is also spaced. This allows to have results below the prompt, or indented without using spaces. As an example a similar theme to the default in rofi is added which uses this feature.

Without the feature:

With the feature: