{cmake} Use the same compiler warnings as godot #1008
Merged
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Turns on compiler warnings based on the SConstruct file in godot.
Also adds
GODOT_CPP_WARNING_AS_ERROR
option to treat warnings as errors. This is turned ON when building godot-cpp on its own (e.g. CI), but defaults to OFF if godot-cpp is being included in another project.(CMake part of #999)