[wish] Include modern icons for GVim to improve default appearance

[skywind3000]

The default GVim icons look too outdated, which discourages many new users from using GVim, and older users often choose to disable the GVim icon.

There is an existing plugin which can replace default icons of GVim

vim-toolbar-icons-silk:

modern icons:

default icons:

This plugin makes GVim look much more modern, especially on high-resolution screens. Can it be released together with GVim?