Adapted to new API (builds with UE4.24.3)

[nathanael-k]

Some small changes to the code to make it compatible with the latest version of UE4. Build was only tested on Windows 10.

[AbaoFromCUG]

@nathanael-k Hello 😄 , I clone your branch add-nathanael-k , build it (python build.py) success. But I run command vset /viewmode object_mask , I got error image
raw lit viewmode

form lit viewmode to object_mask viewmode

raw depth viewmode

form depth viewmode to object_mask viewmode

I refrence issus , branch:add-nathanael-k has the same promblem

My env

• Win10 64bit
• UE4.24.3

I not familar with UE4, so I donn't know how to repair it, if object_mask cann't be repair , I have to use UE4 4.16, it is work