HashMap: Allow hashing of differently typed keys #305

Job	Run time
📊 Static checks / Code style, file formatting, and docs	1m 3s
🍏 iOS / Template (target=template_release)	9m 15s
🍎 macOS / Editor (target=editor, tests=yes)	27m 22s
🤖 Android / Editor (target=editor)	22m 12s
🍎 macOS / Template (target=template_release)	21m 47s
🐧 Linux / Editor w/ Mono (target=editor)	35m 25s
🤖 Android / Template arm32 (target=template_release, arch=arm32)	17m 21s
🐧 Linux / Editor with doubles and GCC sanitizers (target=editor, tests=yes, dev_build=yes, scu_build=yes, precision=double, use_asan=yes, use_ubsan=yes, linker=gold)	40m 54s
🤖 Android / Template arm64 (target=template_release, arch=arm64)	17m 13s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	32m 47s
🌐 Web / Template w/ threads (target=template_release, threads=yes)	24m 28s
🌐 Web / Template w/o threads (target=template_release, threads=no)	23m 40s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	30m 22s
🏁 Windows / Editor (target=editor, tests=yes)	48m 5s
🏁 Windows / Template (target=template_release)	34m 45s
🐧 Linux / Template w/ Mono (target=template_release)	23m 41s
🐧 Linux / Minimal template (target=template_release, everything disabled)	16m 42s
🪲 Godot CPP / Build and test Godot CPP	7m 57s
	7h 14m 59s

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