Allow exporting generic properties #7

Job	Run time
📊 Static checks / Code style, file formatting, and docs	54s
🤖 Android / Template (target=template_release)	27m 30s
🍏 iOS / Template (target=template_release)	8m 30s
🌐 Web / Template w/ threads (target=template_release, threads=yes)	22m 20s
🍎 macOS / Editor (target=editor, tests=yes)	26m 17s
🌐 Web / Template w/o threads (target=template_release, threads=no)	21m 55s
🐧 Linux / Editor w/ Mono (target=editor)	37m 18s
🍎 macOS / Template (target=template_release)	15m 50s
🐧 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)	41m 22s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	31m 27s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	28m 27s
🏁 Windows / Editor (target=editor, tests=yes)	47m 2s
🐧 Linux / Template w/ Mono (target=template_release)	22m 51s
🏁 Windows / Template (target=template_release)	30m 26s
🐧 Linux / Minimal template (target=template_release, everything disabled)	13m 25s
🪲 Godot CPP / Build and test Godot CPP	7m 12s
	6h 22m 46s

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