Lots of quality of life improvements (and bug fixes):
* Class(), ClassIf(), ClassIfElse() methods
* <wave:style> that can use a file vdom:/// url
* UseStateWithFn() to allow for functional setters
* If, IfElse, and ForEach for vdom construction
* batched updates for large updates -- streaming -- to get around packet size issues
* more flexible file sending code, for []byte, io.Reader, fs.File, and a fileName (with optional MimeType)
* fix the vdom:// protocol handler to work with fetch
* updated wshcmd-html for new best practices
