Support for external allocators: #279

Job	Run time
windows (windows-latest, v143, x64, Debug,Release, ON, ON, OpenGL+Vulkan, ON, ON, ON, YES, ON, OFF)	23m 49s
windows (windows-latest, v143, x64, Release, OFF, OFF, OFF, OFF, OFF, NO, OFF, OFF)	4m 38s
windows (windows-latest, v143, x64, Release, OFF, OFF, OFF, OFF, OFF, NO, OFF, ON)	5m 1s
windows (windows-latest, v143, x64, Release, OFF, OFF, OFF, OFF, OFF, NO, ON, ON)	3m 31s
windows (windows-latest, CLangCL, x64, Debug,Release, ON, ON, OpenGL+Vulkan, ON, ON, ON, YES, ON,...	28m 30s
windows (windows-latest, CLangCL, x64, Release, OFF, OFF, OFF, OFF, OFF, NO, OFF, OFF)	4m 17s
windows (windows-latest, CLangCL, x64, Release, OFF, OFF, OFF, OFF, OFF, NO, OFF, ON)	5m 36s
windows (windows-latest, CLangCL, x64, Release, OFF, OFF, OFF, OFF, OFF, NO, ON, ON)	7m 24s
windows (windows-2019, v142, x64, Debug,Release, ON, ON, OpenGL+Vulkan, ON, ON, ON, NO, ON, OFF, ...	21m 20s
windows (windows-latest, CLangCL, arm64, Debug,Release, ON, ON, OFF, ON, ON, ON, YES, Visual Stud...	14m 3s
	1h 58m 9s

Provide feedback