SNAP: Add snap/snapcraft.yaml #444

Job	Run time
android / build_android (Release, android_arm64_v8a, 6.6.3)	3m 34s
android / build_android (Release, android_x86_64, 6.6.3)	3m 25s
mingw / build mingw (Release)	7m 18s
msvc / build_msvc (Release, 6.6.2)	5m 24s
msvc / build_msvc (Release, 5.15.2)	4m 10s
msvc / build_msvc (Release, 5.12.12)	3m 29s
mingw / build mingw (Debug)	7m 24s
msvc / build_msvc (Debug, 6.6.2)	3m 23s
msvc / build_msvc (Debug, 5.15.2)	1m 47s
msvc / build_msvc (Debug, 5.12.12)	2m 43s
ubuntu / build_ubuntu (Release)	5m 44s
macos / build_macos (Release, 6.6.2, clang_64, x86_64, x64-osx)	5m 21s
macos / build_macos (Release, 5.15.2, clang_64, x86_64, x64-osx)	2m 24s
macos / build_macos (Release, 5.12.12, clang_64, x86_64, x64-osx)	3m 12s
macos / build_macos (Debug, 6.6.2, clang_64, x86_64, x64-osx)	4m 10s
macos / build_macos (Debug, 5.15.2, clang_64, x86_64, x64-osx)	3m 9s
macos / build_macos (Debug, 5.12.12, clang_64, x86_64, x64-osx)	2m 52s
deploy	8s
	1h 9m 37s

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