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/lexers/c/cheetah.go

@@ -0,0 +1,37 @@
+package c
+
+import (
+	. "github.com/alecthomas/chroma" // nolint
+	"github.com/alecthomas/chroma/lexers/internal"
+	. "github.com/alecthomas/chroma/lexers/p" // nolint
+)
+
+// Cheetah lexer.
+var Cheetah = internal.Register(MustNewLexer(
+	&Config{
+		Name:      "Cheetah",
+		Aliases:   []string{"cheetah", "spitfire"},
+		Filenames: []string{"*.tmpl", "*.spt"},
+		MimeTypes: []string{"application/x-cheetah", "application/x-spitfire"},
+	},
+	Rules{
+		"root": {
+			{`(##[^\n]*)$`, ByGroups(Comment), nil},
+			{`#[*](.|\n)*?[*]#`, Comment, nil},
+			{`#end[^#\n]*(?:#|$)`, CommentPreproc, nil},
+			{`#slurp$`, CommentPreproc, nil},
+			{`(#[a-zA-Z]+)([^#\n]*)(#|$)`, ByGroups(CommentPreproc, Using(Python), CommentPreproc), nil},
+			{`(\$)([a-zA-Z_][\w.]*\w)`, ByGroups(CommentPreproc, Using(Python)), nil},
+			{`(\$\{!?)(.*?)(\})(?s)`, ByGroups(CommentPreproc, Using(Python), CommentPreproc), nil},
+			{`(?sx)
+                (.+?)               # anything, followed by:
+                (?:
+                 (?=\#[#a-zA-Z]*) | # an eval comment
+                 (?=\$[a-zA-Z_{]) | # a substitution
+                 \Z                 # end of string
+                )
+            `, Other, nil},
+			{`\s+`, Text, nil},
+		},
+	},
+))