Remove use of obsolete ImGui functions - v1.89 #491

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Job	Run time
Windows MSVC Shared Release	2m 14s
clang-format	7s
Windows MSVC Shared Debug	1m 16s
Windows MSVC Static Release	3m 10s
Windows MSVC Static Debug	2m 12s
Windows ClangCL Shared Release	3m 9s
Windows ClangCL Shared Debug	2m 12s
Windows ClangCL Static Release	4m 18s
Windows ClangCL Static Debug	4m 26s
Windows Clang Shared Release	2m 18s
Windows Clang Shared Debug	2m 28s
Windows Clang Static Release	2m 24s
Windows Clang Static Debug	2m 17s
Linux GCC Shared Release	44s
Linux GCC Shared Debug	49s
Linux GCC Static Release	1m 8s
Linux GCC Static Debug	1m 24s
Linux Clang Shared Release	53s
Linux Clang Shared Debug	36s
Linux Clang Static Release	1m 18s
Linux Clang Static Debug	1m 4s
macOS Clang Shared Release	1m 26s
macOS Clang Shared Debug	50s
macOS Clang Static Release	1m 10s
macOS Clang Static Debug	1m 18s
	45m 11s

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