Suggestion: add -X, -Y, -Z to negative axes on viewport gizmo

[jdegenstein]

I think it would be valuable to label the negative axes with e.g. "-X" as well. When looking at the negative axes it makes it a bit clearer what view is being used.

used this tool to test https://fennec-hub.github.io/three-viewport-gizmo/#/config

and exported to the attached config file:
orientation_gizmo.json

[Yeicor]

Implemented in b2f9880 and released in v0.8.11. Thanks for looking into it.

[jdegenstein]

Thank you!