240503 - UE 5.4 support

Added support for UE 5.4. See also https://youtu.be/Ebui0TXyfKc

Note: There is a known Epic's issue, which results in the "Missing String Table Entry" text showing for all the warning and error messages in 5.4 projects. 
There is a way to fix this problem but it has to be done manually for each 5.4 project. The fix is described in the "Missing string table entry" chapter in this document.
Hopefully, Epic will fix this issue in the next HotFix.