Updated Github matrix and Makefile to use COMPILER parameter #1632
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Summary
SUMMARY: Infrastructure "Fix CI builds"
Purpose of change
Fixes #1627
Describe the solution
Made Makefile look into COMPILER parameter
Describe alternatives you've considered
Just remove Makefile and use only cmake.
Testing
Not yet
Additional context
Found out that we don't actually use compilers from matrix when trying to bump C++ version.
#1624
Also little changes in code and some documenting comments.