Class for loading a font in JSON format. Returns a [page:Font Font], which is an
		array of [page:Shape Shape]s representing the font.
		This uses the [page:FileLoader] internally for loading files. 
		You can convert fonts online using [link:https://gero3.github.io/facetype.js/ facetype.js]
		
		[example:webgl_geometry_text_shapes geometry / text / shapes ]
		[example:webgl_geometry_text geometry / text ]
		
		var loader = new THREE.FontLoader();
		var font = loader.load(
			// resource URL
			'fonts/helvetiker_bold.typeface.json',
			// onLoad callback
			function ( font ) {
				// do something with the font
				scene.add( font );
			},
			// onProgress callback
			function ( xhr ) {
				console.log( (xhr.loaded / xhr.total * 100) + '% loaded' );
			},
			// onError callback
			function ( err ) {
				console.log( 'An error happened' );
			}
		);
		
		
		[page:LoadingManager manager] — The [page:LoadingManager loadingManager] for the loader to use. Default is [page:LoadingManager THREE.DefaultLoadingManager].
		Creates a new [name].
		
See the base [page:Loader] class for common properties.
See the base [page:Loader] class for common methods.
		[page:String url] — the path or URL to the file. This can also be a
			[link:https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URIs Data URI].
		[page:Function onLoad] — Will be called when load completes. The argument will be the loaded [page:Font font].
		[page:Function onProgress] — Will be called while load progresses. The argument will be the XMLHttpRequest instance, which contains .[page:Integer total] and .[page:Integer loaded] bytes.
		[page:Function onError] — Will be called when load errors.
		Begin loading from url and pass the loaded [page:Texture texture] to onLoad.
		
		[page:Object json] — The JSON structure to parse.
		Parse a JSON structure and return a [page:Font].
		
[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]