Unify compilation flags in CMake

[KFilipek]

Some flags overlaps with -Wall, -Wextra, -Wpedantic. They should be reworked and some of them are marked below.

                    -fPIC 
                    -Wall
                    -Wextra
                    -Wpedantic
                    -Wempty-body // enabled by: -Wextra
                    -Wunused-parameter // enabled by: -Wextra
                    -Wformat // enabled by: -Wall and set to 1 (-Wformat=1)
                    -Wformat-security
                    -Wcast-qual
                    -Wunused-result // Enabled by default, to use this feature there should be annotation in code, e.g.: __attribute__ ((warn_unused_result))

To see what parameters overlap look at the https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html

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