Steam Parse graphics provider root#5532
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Currently "FEXCompatTool" assumes that the rootfs provided by "STEAM_COMPAT_GRAPHICS_PROVIDER" is the parent directory of "graphics_provider.json".
This is not always correct. The Steam graphics provider manifest can specify the root path in
graphics_provider_v0.root, and that path can be either absolute or relative to the manifest.This PR parses "graphics_provider.json" and uses "graphics_provider_v0.root" when available. Relative paths are resolved against the real manifest path, while invalid/missing manifests keep the previous parent-directory fallback.
Fixes: #5434