Code review comment for lp://qastaging/~jaytaoko/nux/nux-renamed-event-members

The todos related to MouseFocusOnOtherArea and SetKeyboardFocus are in files that aren't used in Unity.
In fact the EditTextBox class will soon be deprecated. And ActionItem class needs a rework.

As for Mod3Mask and Mod5Mask, it seems that my keyboard does not have the keys to generate them. I think I need more information on this.