Update to enhanced input system

[jimsimonz]

The standard input system is now deprecated so input mappings need updating to support the new EnhancedInput subsystem.

https://docs.unrealengine.com/4.26/en-US/InteractiveExperiences/Input/EnhancedInput/

This means that the input mappings can reside in the plugin content folder rather than in the input mappings .ini that had to be copied between projects previously.

[Ultraleap-Dan]

Hi, thank you for your report. We have raised this to our engineering backlog to be investigated further. These input mappings are not currently used and you could remove the nodes that are causing the warnings from your project to clear these errors.