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Fix compiler warnings caused by std::unary_function

Rafał Siejakowski requested to merge S-Rafael/inkscape:no-unary into master

This MR removes almost¹ all uses of the templates std::unary_function and std::binary_function. These templates are deprecated in C++17 and generate lots of compile warnings on gcc 12.1.0.

Additionally, I got rid of an inefficient map storing precomputed bit masks. The CPU can shift bits much faster than it can read from memory.

¹ – the remaining uses of these templates are being taken care of by @pbs3141 in !4463 (merged)

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