Use C++17 [[fallthrough]] to make intentional fallthroughs explicit
#405
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Just a small cleanup that removes the need for a GCC-specific pragma.
Clang/Emscripten would also generate this warning BTW if
-Wimplicit-fallthroughwas passed explicitly (it doesn't seem to be enabled by-Wall -Wextra). From a quick test it can be silenced for both GCC and Clang-derived compilers by ignoring-Wimplicit-fallthroughinstead of-Wimplicit-fallthrough=(note the trailing=). But here using[[fallthrough]]is IMO better as it makes the intention explicit for all compilers.