Description

Thenbl::this_example::builtin::build::get_spirv_key function should allow custom, user-defined data.

Description of the related problem

Currently, there is no reasonable way to create shader permutations based on data outside of thelimit orfeatures structs. For example, such functionality would be needed in the28_FFTBloom example:https://github.com/Devsh-Graphics-Programming/Nabla-Examples-and-Tests/blob/e5d5ae2ca9137a6966d00aa039f3e6dae7c23fb9/28_FFTBloom/main.cpp#L183-L207.