feat(editor): bundle all emoji files

Bundle all emoji files int assets and extract into app support dir
when loading data.

This makes loading emoji easy in poor network environments and saved
10MB network flows but increased app size by 10MB.

A further step is that making updating emoji from server possible, what
it means is an optional feature to check and load all non-bundled emoji
from server dynamically, as a passive feature what user can trigger but
don't do it without user actions.

CHANGELOG.md

@@ -67,6 +67,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
   - 默认关闭，可在设置 -> 窗口中开启。
 - app: 在linux上通过`XDG_CURRENT_DESKTOP`检查是否位于平铺窗管环境中，如果是，不再记录窗口大小和位置。
 - app: 更新应用图标（感谢@Qing-Novel）。
+- app: 打包表情，现在应用安装包内自带所有表情。
 - 登录：在登录界面显示注册账户的跳转链接。
 - 历史：新增帖子浏览记录。
   - 记录帖子名称、浏览的用户，帖子所在分区以及浏览时间。