VS Code Prettier plugin as default formatter

[arcticicestudio]

With VS Code version 1.33.x a notification will be shown when there are multiple formatter found for the file type in the currently active editor. Since Prettier supports most languages and is the de-factor standard tool the VS Code Prettier plugin will be configured as editor default.
When there are unsupported languages or languages like Go that come with their own toolchain (gofmt, goimports etc.) the default can be overridden through the languages-specific settings scopes.