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/context.go

@@ -0,0 +1,38 @@
+package ansi
+
+import (
+	"html"
+	"strings"
+
+	"github.com/microcosm-cc/bluemonday"
+)
+
+// RenderContext holds the current rendering options and state.
+type RenderContext struct {
+	options Options
+
+	blockStack *BlockStack
+	table      *TableElement
+
+	stripper *bluemonday.Policy
+}
+
+// NewRenderContext returns a new RenderContext.
+func NewRenderContext(options Options) RenderContext {
+	return RenderContext{
+		options:    options,
+		blockStack: &BlockStack{},
+		table:      &TableElement{},
+		stripper:   bluemonday.StrictPolicy(),
+	}
+}
+
+// SanitizeHTML sanitizes HTML content.
+func (ctx RenderContext) SanitizeHTML(s string, trimSpaces bool) string {
+	s = ctx.stripper.Sanitize(s)
+	if trimSpaces {
+		s = strings.TrimSpace(s)
+	}
+
+	return html.UnescapeString(s)
+}