[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/buffer/reader.go

@@ -1,44 +0,0 @@
-package buffer
-
-import "io"
-
-// Reader implements an io.Reader over a byte slice.
-type Reader struct {
-	buf []byte
-	pos int
-}
-
-// NewReader returns a new Reader for a given byte slice.
-func NewReader(buf []byte) *Reader {
-	return &Reader{
-		buf: buf,
-	}
-}
-
-// Read reads bytes into the given byte slice and returns the number of bytes read and an error if occurred.
-func (r *Reader) Read(b []byte) (n int, err error) {
-	if len(b) == 0 {
-		return 0, nil
-	}
-	if r.pos >= len(r.buf) {
-		return 0, io.EOF
-	}
-	n = copy(b, r.buf[r.pos:])
-	r.pos += n
-	return
-}
-
-// Bytes returns the underlying byte slice.
-func (r *Reader) Bytes() []byte {
-	return r.buf
-}
-
-// Reset resets the position of the read pointer to the beginning of the underlying byte slice.
-func (r *Reader) Reset() {
-	r.pos = 0
-}
-
-// Len returns the length of the buffer.
-func (r *Reader) Len() int {
-	return len(r.buf)
-}