Restrict fixed_point_t operators to integral_max_size_4 #6408

Job	Run time
Code style, file formatting, and docs	12s
🐧 Linux Debug	6m 36s
🏁 Windows Debug	13m 38s
🏁 Windows Release	12m 26s
🍎 macOS (universal) Debug	8m 26s
🐧 Linux Release	6m 37s
🍎 macOS (universal) Release	5m 49s
📚 Merge Library Files	16s
	54m 0s

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