Get input file and its dependencies.

@param {VinylFile|string} file		File to get for.
@param {Object} options				Options object.
@returns {Promise.<VinylFile[]>}		Vinyl files found.
async function getAllFiles(file, options) {
	let files = await getFiles([file], options);
	while (hasUnloaded(files)) files = await getFiles(files, options);
	return files;
}