Create multiple descriptor pools on demand. There are some degrees of
freedom what is considered a compatible pool to avoid wasting large
pools on small descriptors.

Our unit tests were hitting this exception.

Compute shaders spill uniform buffers on storage buffers, increasing the
expected number.

Avoid using std::array to fix Intellisense not properly compiling this
code and disabling itself on all files that include it.

While we are at it, change the code to use u8 instead of size_t for the
number of instructions in an opcode.

Find sibling node containing a nephew searching from the nephew itself
instead of the uncle.