Compile speedup #979

While using the fmt library in header-only mode was convenient, Cantera uses this library in so many separate source files that using it in this mode was noticably increasing overall compilation time.

Code for the VCS_SOLVE class, which was split up among 12 source files, is now consolidated into just vcs_solve.cpp and vcs_solve_TP.cpp. This reduces the amount of time spent compiling the VCS solver by ~50%.

For classes derived from ThermoPhase, instead of having separate constructors for the default constructor and the constructor which takes an input file and phase id, we can use the case where both arguments are the default (empty string) to construct a phase without using an input file. This eliminates the need to repeat any initialization that takes place in the constructor.

Keeping debug symbols around results in much larger object files, which in turn get copied into the various libraries and test executables, and the extra I/O from reading and writing all of these larger files slows down the build.

Compiling with the NDEBUG macro defined skips assertion checks, such as those in standard library code. Skipping these checks allows the tests to run slightly faster. Compiling with a system copy of Sundials speeds up running the test suite slightly because the Sundials library being used is still compiled with optimizations turned on, as opposed to the code within Cantera, that has to be compiled without optimizations so that the line coverage will be accurate.

Python 3.5 reached end of life in September 2020.

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Compile speedup #979

Compile speedup #979

Commits on Feb 19, 2021