Create the possibility to overwrite the style loader and generally the loader settings

[tooltonix]

Hello,

i am new to Webpack Encore and am currently trying to override the style loader settings. During development I use the style loader in devServer and have disabled CSS extraction (Encore.disableCssExtraction()). I'm trying to override the style loader options and couldn't find a way to do so in Webpack Encore. So I now iterate the webpackConfig.module.rules to look for the settings there, which I find a bit ugly. Besides the function configureCssLoader() is there also a function configureStyleLoader() or a more elegant way to override the settings of the StyleLoader?

My code looks like this:

`
if (Encore.isDevServer()) {

Encore.disableCssExtraction();
for (rule of webpackConfig.module.rules) {
    if (rule.test.toString().match(/s\[ac\]ss/)) {
        if (rule.oneOf) {
            for (let set of rule.oneOf) {
                set.use[0] = {
                    loader: 'style-loader',
                    options: {
                        ...
                    }
                };
            }
        }
    }
}

`

[tooltonix]

made a pull-request in #715