Building GameStudio with different graphics API

[Doprez]

Some documentation to add for building Game Studio with source.

Problem:
https://discord.com/channels/500285081265635328/500290856532574209/1395829713569579149

Azeno: Anyone any hints on how to debug the Direct3D12 code? I did set <StrideGraphicsApiDependentBuildAll>true</StrideGraphicsApiDependentBuildAll> in Stride.props, Visual Studio says the related code is in play, in my sample I game I set     <StrideGraphicsApi>Direct3D12</StrideGraphicsApi> but when running the editor and opening that game with it, no breakpoints are hit. I must be doing something fundamentally wrong.

Solution:
https://discord.com/channels/500285081265635328/500290856532574209/1396105042762928268

Azeno: Ok, had to add <StrideGraphicsApi>Direct3D12</StrideGraphicsApi> to Stride.GameStudio, now it picked it up.