[bugfix] html escape special characters in text instead of totally removing them (#719)

* remove minify dependency

* tidy up some tests

* remove pre + postformat funcs

* rework sanitization + formatting

* update tests

* add some more markdown tests

vendor/github.com/tdewolff/parse/v2/html/README.md

@@ -1,98 +0,0 @@
-# HTML [![API reference](https://img.shields.io/badge/godoc-reference-5272B4)](https://pkg.go.dev/github.com/tdewolff/parse/v2/html?tab=doc)
-
-This package is an HTML5 lexer written in [Go][1]. It follows the specification at [The HTML syntax](http://www.w3.org/TR/html5/syntax.html). The lexer takes an io.Reader and converts it into tokens until the EOF.
-
-## Installation
-Run the following command
-
-	go get -u github.com/tdewolff/parse/v2/html
-
-or add the following import and run project with `go get`
-
-	import "github.com/tdewolff/parse/v2/html"
-
-## Lexer
-### Usage
-The following initializes a new Lexer with io.Reader `r`:
-``` go
-l := html.NewLexer(parse.NewInput(r))
-```
-
-To tokenize until EOF an error, use:
-``` go
-for {
-	tt, data := l.Next()
-	switch tt {
-	case html.ErrorToken:
-		// error or EOF set in l.Err()
-		return
-	case html.StartTagToken:
-		// ...
-		for {
-			ttAttr, dataAttr := l.Next()
-			if ttAttr != html.AttributeToken {
-				break
-			}
-			// ...
-		}
-	// ...
-	}
-}
-```
-
-All tokens:
-``` go
-ErrorToken TokenType = iota // extra token when errors occur
-CommentToken
-DoctypeToken
-StartTagToken
-StartTagCloseToken
-StartTagVoidToken
-EndTagToken
-AttributeToken
-TextToken
-```
-
-### Examples
-``` go
-package main
-
-import (
-	"os"
-
-	"github.com/tdewolff/parse/v2/html"
-)
-
-// Tokenize HTML from stdin.
-func main() {
-	l := html.NewLexer(parse.NewInput(os.Stdin))
-	for {
-		tt, data := l.Next()
-		switch tt {
-		case html.ErrorToken:
-			if l.Err() != io.EOF {
-				fmt.Println("Error on line", l.Line(), ":", l.Err())
-			}
-			return
-		case html.StartTagToken:
-			fmt.Println("Tag", string(data))
-			for {
-				ttAttr, dataAttr := l.Next()
-				if ttAttr != html.AttributeToken {
-					break
-				}
-
-				key := dataAttr
-				val := l.AttrVal()
-				fmt.Println("Attribute", string(key), "=", string(val))
-			}
-		// ...
-		}
-	}
-}
-```
-
-## License
-Released under the [MIT license](https://github.com/tdewolff/parse/blob/master/LICENSE.md).
-
-[1]: http://golang.org/ "Go Language"