Fix zooming.

Not sure when this changed, maybe its been this way for a while, but currently holding Ctrl key and slightly moving the mouse causes the room editor, image editor etc.. to zoom the view in and out.

This gets in the way of common operations like copy/paste/undo etc.. and forces completely removing hand from mouse to keep from making the screen freak out.

I looked through keybindings and settings but didn't see a way to disable this. Maybe I missed it.

This is on Windows. On Mac it doesn't...

Fix zooming.