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/stylewriter.go

@@ -0,0 +1,33 @@
+package ansi
+
+import (
+	"bytes"
+	"io"
+)
+
+// StyleWriter is a Writer that applies styling on whatever you write to it.
+type StyleWriter struct {
+	ctx   RenderContext
+	w     io.Writer
+	buf   bytes.Buffer
+	rules StylePrimitive
+}
+
+// NewStyleWriter returns a new StyleWriter.
+func NewStyleWriter(ctx RenderContext, w io.Writer, rules StylePrimitive) *StyleWriter {
+	return &StyleWriter{
+		ctx:   ctx,
+		w:     w,
+		rules: rules,
+	}
+}
+
+func (w *StyleWriter) Write(b []byte) (int, error) {
+	return w.buf.Write(b)
+}
+
+// Close must be called when you're finished writing to a StyleWriter.
+func (w *StyleWriter) Close() error {
+	renderText(w.w, w.ctx.options.ColorProfile, w.rules, w.buf.String())
+	return nil
+}