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/alecthomas/chroma/formatters/tokens.go

@@ -0,0 +1,18 @@
+package formatters
+
+import (
+	"fmt"
+	"io"
+
+	"github.com/alecthomas/chroma"
+)
+
+// Tokens formatter outputs the raw token structures.
+var Tokens = Register("tokens", chroma.FormatterFunc(func(w io.Writer, s *chroma.Style, it chroma.Iterator) error {
+	for t := it(); t != chroma.EOF; t = it() {
+		if _, err := fmt.Fprintln(w, t.GoString()); err != nil {
+			return err
+		}
+	}
+	return nil
+}))