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

Examina el código de verificación de conectividad que descarga un archivo del sitio web de 07th-mod. Modifícalo para que intente primero HTTPS y, si falla, recurra a HTTP. Además, añade sondeos tanto para github.com como para 07th-mod.com. El instalador debe mostrar una advertencia si se detectan errores SSL y registrar los resultados de los sondeos. Consulta el issue relacionado #189 para el contexto.

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