Separate irrlicht's gui elements from main Game class to subclasses #1184

Job	Run time
Linux-gcc-10-3-0	2m 9s
Linux-aarch64-gcc-7-5-0	2m 54s
Ios-cctools (ios-cctools, installed_aarch64-ios-cctools.7z, arm64-iphoneos, arm, arm64-ios, arm64...	4m 41s
Linux-gcc-11	2m 17s
Ios-cctools (ios-armv7-cctools, installed_armv7-ios-cctools.7z, armv7-iphoneos, arm, arm-ios, arm...	4m 35s
Linux-gcc-7-5-0	2m 35s
Mac-os	1m 44s
Ios-cctools (iossim-x64-cctools, installed_x64-iossim-cctools.7z, x86_64-iphonesimulator, x86_64,...	4m 14s
Mac-os-aarch64	1m 11s
Mac-os-cctools (osx-cctools, installed_x64-osx-cctools.7z, x86_64-macosx, x86_64, x64)	3m 50s
Windows	3m 59s
Mac-os-cctools (osx-aarch64-cctools, installed_aarch64-osx-cctools.7z, arm64-macosx, arm, arm64)	4m 28s
Windows-vs2019	3m 35s
Mac-os-universal	18s
Mac-os-universal-cctools	22s
Ios-universal-cctools	33s
Notify-success	4s
	43m 29s

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