- Removed "fix" to initialize params to 0, as that happens midway through the Accumulation process, resetting a lot of variables. Instead rewrote InitParams to take an inout parameter and clear the params first thing in the Accumulate function.
- Bind first multi-render target as depth target, fixes RenderDoc errors about color/depth buffer size mismatch.
- Ensure keywords that need a value are redefined using the correct value.
- Removed obsolete auto-TCR constants struct.
