Use glamour and termev to render/colorize content (#181)

Merge branch 'master' into use-glamour

select Glamour Theme based on BackgroundColor

Merge branch 'master' into use-glamour

Merge branch 'master' into use-glamour

update termev

update go.mod

label color colorate

use glamour for issue content

Vendor: Add glamour

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: 6543 <6543@obermui.de>
Reviewed-on: https://gitea.com/gitea/tea/pulls/181
Reviewed-by: techknowlogick <techknowlogick@gitea.io>
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>

vendor/github.com/charmbracelet/glamour/ansi/listitem.go

@@ -0,0 +1,27 @@
+package ansi
+
+import (
+	"io"
+	"strconv"
+)
+
+// An ItemElement is used to render items inside a list.
+type ItemElement struct {
+	Enumeration uint
+}
+
+func (e *ItemElement) Render(w io.Writer, ctx RenderContext) error {
+	var el *BaseElement
+	if e.Enumeration > 0 {
+		el = &BaseElement{
+			Style:  ctx.options.Styles.Enumeration,
+			Prefix: strconv.FormatInt(int64(e.Enumeration), 10),
+		}
+	} else {
+		el = &BaseElement{
+			Style: ctx.options.Styles.Item,
+		}
+	}
+
+	return el.Render(w, ctx)
+}