TUN-4116: Ingore credentials-file setting in configuration file during tunnel create and delete opeations.

This change has two parts:
1. Update to newer version of the urfave/cli fork that correctly sets flag value along the context hierarchy while respecting config file overide behavior of the most specific instance of the flag.
2. Redefine --credentials-file flag so that create and delete subcommand don't use value from the config file.

vendor/github.com/russross/blackfriday/v2/html.go

@@ -132,7 +132,10 @@ func NewHTMLRenderer(params HTMLRendererParameters) *HTMLRenderer {
 	}
 
 	if params.FootnoteReturnLinkContents == "" {
-		params.FootnoteReturnLinkContents = `<sup>[return]</sup>`
+		// U+FE0E is VARIATION SELECTOR-15.
+		// It suppresses automatic emoji presentation of the preceding
+		// U+21A9 LEFTWARDS ARROW WITH HOOK on iOS and iPadOS.
+		params.FootnoteReturnLinkContents = "<span aria-label='Return'>↩\ufe0e</span>"
 	}
 
 	return &HTMLRenderer{
@@ -616,7 +619,7 @@ func (r *HTMLRenderer) RenderNode(w io.Writer, node *Node, entering bool) WalkSt
 		}
 	case Code:
 		r.out(w, codeTag)
-		escapeHTML(w, node.Literal)
+		escapeAllHTML(w, node.Literal)
 		r.out(w, codeCloseTag)
 	case Document:
 		break
@@ -762,7 +765,7 @@ func (r *HTMLRenderer) RenderNode(w io.Writer, node *Node, entering bool) WalkSt
 		r.cr(w)
 		r.out(w, preTag)
 		r.tag(w, codeTag[:len(codeTag)-1], attrs)
-		escapeHTML(w, node.Literal)
+		escapeAllHTML(w, node.Literal)
 		r.out(w, codeCloseTag)
 		r.out(w, preCloseTag)
 		if node.Parent.Type != Item {