Reduce allocation of temporary values on heap

Pavel Solodovnikovrequested to merge
pa.solodovnikov/cmake:feature/memory_management_improvements into master

This MR aims to address issues with redundant copying around of temporaries throughout the CMake code base.

What is done there:

  • std::move is used whenever possible to move a temporary instead of copying it.
  • <container>.push_back is changed to <container>.emplace_back in several places to be able to construct objects in-place instead of moving them.

Topic-rename: reduce-temporaries

Edited by Pavel Solodovnikov

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