[tokenizer] use strings instead of buffers
[tokenizer] use strings instead of buffers

has a huge impact on speed

mail-apps/htmlparser2,kirbysayshi/node-htmlparser,magicode/htmlparser2,frontapp/htmlparser2,fasterize/node-htmlparser,broadly/htmlparser2,frontapp/htmlparser2,broadly/htmlparser2,jasonsanjose/htmlparser2,mail-apps/htmlparser2,jasonsanjose/htmlparser2,magicode/htmlparser2