update getRegions() to return std::span<> instead of core::SRange<>

[tad1]

Description

shallowly updates getRegions() in ICPUImage.h (and methods explicit usages) to use std::span<>

to obtain raw pointers (required by some methods) <span>.data() and <span>.data() + <span>.size() is used, since it's the only method to access raw pointers without dereferencing iterators

dereferencing .end() iterator may cause address violation segfault

Testing

passes 24_ColorSpaceTest (requires a patch - see 0aa4c5)

TODO list:

• [x] decide if methods like CBasicImageFilterCommon::executePerRegion should use iterators or raw pointers (current)

[devshgraphicsprogrammingjenkins]

[CI]: Can one of the admins verify this patch?

[devshgraphicsprogramming]

Maybe make the executePerRegion take a span as well?

[tad1]

Maybe make the executePerRegion take a span as well?

done in 42c1f12