Recovery middleware does not obey gin.DisableConsoleColor()

[mgabeler-lee-6rs]

Description

Recovery middleware does not obey gin.DisableConsoleColor(), but instead has hard coded ansi color sequences always included in its output

How to reproduce

package main

import (
	"fmt"
	"github.com/gin-gonic/gin"
)

func main() {
	gin.DisableConsoleColor()
	g := gin.Default()
	g.GET("/panic", func(c *gin.Context) {
		panic(fmt.Errorf("demo"))
	})
	g.Run(":9000")
}

Expectations

$ curl http://localhost:9000/panic

Expect logged panic output to not have color codes.

Actual result

Logged panic has color codes.

Environment

• go version: 1.14.x
• gin version (or commit ref): 1.6.3
• operating system: Linux

Additional Information

https://github.com/gin-gonic/gin/blob/master/recovery.go#L54 -- this should be using gin.IsOutputColor to determine whether to include color codes in the logger prefix

This is more important when sending the recovery log output through something like zerolog, where the color codes just end up being escape codes inside some other string and have no hope of being rendered.

[tkgalk]

I have a naive solution to this which works fine but unexports the ConsoleColorMode variable. A more proper solution would be to provide a Logger inside the Recovery as only Logger has Color/Non-Color support.