* In a previous update in 2021 many copyright ranges were truncated
accidentally, and some files have been copy-pasted with wrong years. These
dates have been fixed based on git history and original copyright messages.
Corrects width, height, and depth calculation in WriteToSubresource for the specified subresource when storing provided source data blob. Using base resource dimensions could have led to source-data read access violation.
Also updates corresponding test to validate subresource modification.
* It's not particularly scalable and can be brittle to driver changes, and we
can use targeted specific pixel tests to check what we really want - to see if
the output has rendered correctly.
* Overlay tests still check files directly - this is a future refactor to
remove.
baldurk