Move server files into their subfolders #2353

Job	Run time
📊 Static checks / Code style, file formatting, and docs	53s
🐧 Linux / Editor w/ Mono (target=editor)	41m 58s
🐧 Linux / Template w/ Mono, release (target=template_release)	18m 23s
🍏 iOS / Template (target=template_release)	10m 33s
🐧 Linux / Minimal template (target=template_release, everything disabled)	11m 38s
🏁 Windows / Template (target=template_release)	21m 36s
🏁 Windows / Editor (target=editor)	48m 14s
🐧 Linux / Editor with ThreadSanitizer (target=editor, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	36m 27s
🐧 Linux / Template w/ Mono, debug (target=template_debug)	20m 13s
🍎 macOS / Editor (target=editor)	36m 21s
🍎 macOS / Template (target=template_release)	20m 0s
🏁 Windows / Template w/ GCC (target=template_release, use_mingw=yes)	35m 28s
🌐 Web / Template w/ threads (target=template_release, threads=yes)	16m 21s
🤖 Android / Template arm32 (target=template_release, arch=arm32)	13m 40s
🤖 Android / Template arm64 (target=template_release, arch=arm64)	12m 52s
🌐 Web / Template w/o threads (target=template_release, threads=no)	16m 19s
	6h 0m 56s

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