User Selectable Download Locations

[Starnsworth]

Currently the launcher has two seperate locations for OpenRCT and OpenLoco projects, as dictated by the GetLocation function and lines 9 & 10 in \IntelOrca.OpenLauncher.Core\Game.cs.

Seperation between my documents and application data seems arbitrary as a test build had success when modifing the constructor for OpenLoco object.

Recommend allowing user selectable download location using '\documents\OpenLauncher<game>" as the default entry as opposed to hard-coded locations.

I will attempt a fix but am unfamilier with avaloniaUI and the way text is being handled.