Prettier Integration

It'd be nice to integrate Prettier into Wild Web Developer to enable features such as CSS formatting.

Originally, I wanted to propose having a Node.JS project builder, which would use the embedded Node.JS instance from Wild Web Developer to allow running Node applications as a build action. This would allow users to create a package.json for their workspace, add prettier as a dev-dependency and run prettier to format on save/automatic build.

However there are issues with this approach:

• A user might want to format CSS and not use a package.json
• Most users who would want to run Node tools such as prettier will most likely have Node on their system. Using the internal/embedded Node from Wild Web Developer might cause differences/issues, and there is a maintance cost for adding options (such as use internal/external node for Node.JS project builder)

So instead, it might be desirable to integrate Prettier directly into Wild Web Developer, and have it run on format.

Prettier is configurable with a configuration file, which will give users nice options such as ignoring certain files when formatting, using single/double quotes, etc.

Prettier is already being used in Spectrum Theme as a project build action.

Comienza revisando el package.json propuesto y los puntos de entrada de format-on-save o de las compilaciones automáticas; el issue no especifica archivos ni pruebas concretos del repositorio. Lee la documentación de configuración y opciones de Prettier y, antes de implementarla, define cómo debe la integración directa ejecutar el formateo y respetar la configuración del proyecto.