Added 'Default Media Type' setting to the 'Import Swagger' and 'New Project' dialogs

[VjacheslavVytjagov]

Added 'Default Media Type' setting and its using in the Swagger2Importer

[VjacheslavVytjagov]

You just did not notice... I kept old versions in the both cases like this:

public Swagger2Importer(WsdlProject project, String defaultMediaType) {
    this.project = project
    this.defaultMediaType = defaultMediaType
}

public Swagger2Importer(WsdlProject project) {
    this(project, "application/json")
}

and

static SwaggerImporter createSwaggerImporter(String url, WsdlProject project) {
    return createSwaggerImporter(url, project, DEFAULT_MEDIA_TYPE)
}

[olensmar]

thanks :-)