Colors and !default

[timyourivh]

The $colors lists do not have a !default tag in most (if not all) themes which makes it impossible to change the colors without copying the whole variables file and base theme.

It would be great if this tag is added so it can be modified like every other variable in the variables file.

Example:

https://github.com/primefaces/primevue-sass-theme/blob/49b6c05472de06175f98eba483c9f9aa92ff5867/themes/material/material-dark/_variables.scss#L1-L14

Proposed changes:

     "red": #F44336,
     "primary": $primaryColor
-);
+) !default;