Mouse wheel

The mouse wheel is used to manipulate the size of objects. What can be sized?
 * Move the mouse wheel forward to enlarge the object.
 * Move the mouse wheel backwards to reduce the size of the objext.
 * The model as a whole: If the mouse cursor is over the model window background (no object is selected), the mouse wheel can be used to zoom in or out. The position of the mouse cursor remains unchanged. It is the center of the zooming operation. As a result, an object that you are currently interested in can be viewed in more detail in an intuitive way by pointing the mouse cursor at the object and moving the mouse wheel forward.
 * EEG sensors: If the mouse cursor is over an EEG sensor, the mouse wheel can be used to make the sensor larger or smaller
 * If a selection is present, the mouse wheel can be used to size (expand or shrink) the selection. The center of the expansion/shrinkage is the mouse cursor position.