[FEATURE] (define x 1) preprocessor constants

[LurkAndLoiter]

Description of the requested feature

I'm looking for a way to make :monitor more portable for end users.

The current recommended approach is confusing and limited as even minor differences in geometry would require new ids from my understanding.

Proposed configuration syntax

(define monitor "[1,0]")

(defwindow
    :monitor monitor
    :stacking "fg"
    :geometry (geometry
        :anchor "top center"
        :height 20
        :width "100%")
)

Additional context

This allows simple non dynamic environment alterations across more complex eww configs. You could even make a sourced config.yuck for the end user.