Add several shortcuts for text shader editor #553

Job	Run time
📊 Static checks / Code style, file formatting, and docs	29s
🍎 macOS / Editor (target=editor, tests=yes)	3m 37s
🍏 iOS / Template (target=template_release)	10m 42s
🐧 Linux / Editor w/ Mono (target=editor)	3m 33s
🍎 macOS / Template (target=template_release)	18m 20s
🤖 Android / Editor (target=editor)	24m 49s
🐧 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)	14m 42s
🤖 Android / Template arm32 (target=template_release, arch=arm32)	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)	5m 44s
🤖 Android / Template arm64 (target=template_release, arch=arm64)	17m 8s
🌐 Web / Template w/ threads (target=template_release, threads=yes)	25m 47s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	8m 5s
🏁 Windows / Editor (target=editor, tests=yes)	8m 27s
🌐 Web / Template w/o threads (target=template_release, threads=no)	26m 32s
🐧 Linux / Template w/ Mono (target=template_release)	3m 0s
🏁 Windows / Template (target=template_release)	7m 25s
🐧 Linux / Minimal template (target=template_release, everything disabled)	16m 14s
🪲 Godot CPP / Build and test Godot CPP	8m 22s
	3h 40m 9s

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