Adds "config" query option to override property on options object holding stylus config
Adds "config" query option to override property on options object holding stylus config

Recommended by webpack's documentation:
https://webpack.github.io/docs/how-to-write-a-loader.html#programmable-objects-as-query-option

Uses a different globalConfigCache for each configKey, just in case cache entries are somehow
different when the config is changed.

shama/stylus-loader,walmartlabs/stylus-relative-loader,shama/stylus-loader,walmartlabs/stylus-relative-loader