Rework linking analyzer, remove generator heuristic, change D2D compile options

[Sergio0694]

Closes #804

Description

Take two from #807, with some more tweaks.

This PR includes changes around shader linking:

• Updates the linking analyzer and repurposes it to warn for invalid trivial sampling options instead
• Removes the heuristic automatically enabling shader linking only for shaders with simple inputs
• Add shader linking to the Default preset
• Also a new OptimizeForSize option to the D2D compile options