chore: replace game_scanner usage with winreg

[Jan200101]

closes #101

Not compiled on Windows (I don't have a setup for that, so someone else needs to do it).

Error message was updated to reflect this works on Origin and the EA App (should the text be changed to only mention the EA App, since Origin is considered defunct?), though the function name was not updated.

Moved winapi and winreg dependencies into the windows only dependencies, since other systems don't make use of them.

[GeckoEidechse]

Currently also don't have a working Windows setup rn to test. Will do in a day or two hopefully.

[Alystrasz]

Confirmed working on Windows 10.
FlightCore found the path of my Steam install through registry successfully.

[GeckoEidechse]

FlightCore found the path of my Steam install through registry successfully.

Given that this affects only EA App. We should still test on a setup that only has EA App and no Steam. In particular, detecting Steam install is done via library.vdf and not registry.

[Jan200101]

I'll setup a clean VM and test a fresh install from both Origin and the EA App.

[Alystrasz]

My bad!

[Jan200101]

Fresh Install of Titanfall 2 from the EA App

I'll test Origin later today with Fuck_off_EA_App

[GeckoEidechse]

Fresh Install of Titanfall 2 from the EA App

You're awesome, thanks <3

I'll test Origin later today with Fuck_off_EA_App

Wouldn't mind but honestly not necessary. They should behave the same and tbh I'm not gonna consider it any more. Compared to EA App Origin is a minority and those few that still use it can probably also figure out how to manually set a path should it somehow fail ^^

[Jan200101]

On Origin (with an incomplete install. Why doesn't the EA App have this feature? its really cool!)