[chore] add back exif-terminator and use only for jpeg,png,webp (#3161)

* add back exif-terminator and use only for jpeg,png,webp

* fix arguments passed to terminateExif()

* pull in latest exif-terminator

* fix test

* update processed img

---------

Co-authored-by: tobi <tobi.smethurst@protonmail.com>

vendor/github.com/go-xmlfmt/xmlfmt/xmlfmt.go

@@ -0,0 +1,56 @@
+////////////////////////////////////////////////////////////////////////////
+// Porgram: xmlfmt.go
+// Purpose: Go XML Beautify from XML string using pure string manipulation
+// Authors: Antonio Sun (c) 2016-2019, All rights reserved
+////////////////////////////////////////////////////////////////////////////
+
+package xmlfmt
+
+import (
+	"regexp"
+	"strings"
+)
+
+var (
+	reg = regexp.MustCompile(`<([/!]?)([^>]+?)(/?)>`)
+	// NL is the newline string used in XML output, define for DOS-convenient.
+	NL = "\r\n"
+)
+
+// FormatXML will (purly) reformat the XML string in a readable way, without any rewriting/altering the structure
+func FormatXML(xmls, prefix, indent string) string {
+	src := regexp.MustCompile(`(?s)>\s+<`).ReplaceAllString(xmls, "><")
+
+	rf := replaceTag(prefix, indent)
+	return (prefix + reg.ReplaceAllStringFunc(src, rf))
+}
+
+// replaceTag returns a closure function to do 's/(?<=>)\s+(?=<)//g; s(<(/?)([^>]+?)(/?)>)($indent+=$3?0:$1?-1:1;"<$1$2$3>"."\n".("  "x$indent))ge' as in Perl
+// and deal with comments as well
+func replaceTag(prefix, indent string) func(string) string {
+	indentLevel := 0
+	return func(m string) string {
+		// head elem
+		if strings.HasPrefix(m, "<?xml") {
+			return NL + prefix + strings.Repeat(indent, indentLevel) + m
+		}
+		// empty elem
+		if strings.HasSuffix(m, "/>") {
+			return NL + prefix + strings.Repeat(indent, indentLevel) + m
+		}
+		// comment elem
+		if strings.HasPrefix(m, "<!") {
+			return NL + prefix + strings.Repeat(indent, indentLevel) + m
+		}
+		// end elem
+		if strings.HasPrefix(m, "</") {
+			indentLevel--
+			return NL + prefix + strings.Repeat(indent, indentLevel) + m
+		}
+		defer func() {
+			indentLevel++
+		}()
+
+		return NL + prefix + strings.Repeat(indent, indentLevel) + m
+	}
+}