[GSERIES] Custom Installer Ultimate V2g

[KaktoR]

Came up with a QoL idea while i was building up my launcher

How about to implement a function to let users choose between Steam/GOG in Autorun screen?

Many games are up on Steam and GOG, while GOG needs specific registry settings stored in Registry.iss.

In the end users could choose what version they want to install. That makes conversion makers to upload a single Setup.exe and not 2 different ones (one for Steam, another for GOG). Should save upload bandwitdh and also less wasting space on the FF servers.