Keybinds for buttons on the right of the editor + Move Object Big keybinds

[Starlash]

I suggest adding keybinds for each of those buttons, mainly because Z, X, and C are unused in the editor, and setting those to Edit Special, Edit Group, and Edit Object respectively would greatly speed up the building process. As for the second suggestion, the default keybinds for "Move Object Big" should be IJKL, as those are also unused.