Add detection of SSL problems on startup

Currently we download a file from 07th-mod website to check connectivity, but we don't fallback to downloading via http if https fails.

It may be a good idea to try both - if https fails but http succeeds, likely there is some SSL error, and a warning can be shown in the installer, and a summary of probe results can be printed to the log.

Also, probing both github and 07th-mod.com would be a good idea, as both are required to install the mod.

Also see #189

查看从 07th-mod 网站下载文件的连接检查代码。修改它，使其首先尝试 HTTPS，如果失败则回退到 HTTP。同时添加对 github.com 和 07th-mod.com 的探测。如果检测到 SSL 错误，安装程序应显示警告并记录探测结果。查看相关 issue #189 以了解上下文。

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