[kihx] Make two version of depth buffering: early-z culing or not.

- Add the DepthBuffering class based on the DepthBufferingParamPack legacy class.
- Add EARLY_Z_CULLING preprocessor.
- Early-z culling is executed on rasterizer.
[rasterizer] Modify transform matrix setting.

- Minify scaling factors and adjust near and far values.
- Scale up a cube mesh.
[kihx] Revise a code verifier.

- Ready for a custom assertion.
- Rename assert() -> Assert() and ReentryGuard.