策略组图标

配置策略组中的 icon 字段，支持 http/base64/svg。

关于 GLOBAL 组

GLOBAL策略组也可以在配置文件中自定义

但 web 面板以及部分客户端使用GLOBAL策略组内的 策略组顺序 进行排序

建议在自定义GLOBAL策略组时，书写完整当前配置所有的策略组 (除了 GLOBAL 本身)

http

proxy-groups:
- name: xxx
  icon: https://xxx.xxx/icon.png
  ...

base64

proxy-groups:
- name: xxx
  icon: 'data:image/svg+xml;base64,xxxx'
  ...

svg

proxy-groups:
- name: xxx
  icon: "<svg xmlns=\"http://www.w3.org/2000/svg\" viewBox=\"0 0 48 48\" width=\"48px\" height=\"48px\"><path fill=\"#fbc02d\"
        d=\"M43.611,20.083H42V20H24v8h11.303c-1.649,4.657-6.08,8-11.303,8c-6.627,0-12-5.373-12-12   s5.373-12,12-12c3.059,0,5.842,1.154,7.961,3.039l5.657-5.657C34.046,6.053,29.268,4,24,4C12.955,4,4,12.955,4,24s8.955,20,20,20    s20-8.955,20-20C44,22.659,43.862,21.35,43.611,20.083z\" /><path fill=\"#e53935\"
        d=\"M6.306,14.691l6.571,4.819C14.655,15.108,18.961,12,24,12c3.059,0,5.842,1.154,7.961,3.039 l5.657-5.657C34.046,6.053,29.268,4,24,4C16.318,4,9.656,8.337,6.306,14.691z\" /><path fill=\"#4caf50\"
        d=\"M24,44c5.166,0,9.86-1.977,13.409-5.192l-6.19-5.238C29.211,35.091,26.715,36,24,36    c-5.202,0-9.619-3.317-11.283-7.946l-6.522,5.025C9.505,39.556,16.227,44,24,44z\" /><path fill=\"#1565c0\"
        d=\"M43.611,20.083L43.595,20L42,20H24v8h11.303c-0.792,2.237-2.231,4.166-4.087,5.571 c0.001-0.001,0.002-0.001,0.003-0.002l6.19,5.238C36.971,39.205,44,34,44,24C44,22.659,43.862,21.35,43.611,20.083z\" /></svg>"
  ...

使用 svg 文件的内容时需要对引号进行转义。