core/*.{h,cpp}: speed up build time
Use lib/json.hpp only when needed, and use lib/json_fwd.h elsewhere. Yield a 40% speedup in build time on at least one platform. See #3307.
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Use lib/json.hpp only when needed, and use lib/json_fwd.h elsewhere. Yield a 40% speedup in build time on at least one platform. See #3307.