- Automatically register benchmarks based on `.tscn` files found in the
`benchmarks/` folder.
- `manager.gd` no longer needs to be edited every time a benchmark is added.
- Use full path for include/exclude glob instead of just the last category's name.
- Move benchmarks to a subfolder.
- Position the benchmark label away from the window's edges for better readability,
and increase its outline size.
- Run the dynamic light cull with shadows benchmark
(there was a `.tscn` file but it was unused).
