Detailed optimization of object selection.

【Object Mode】+【Multiple objects are selected】+【shift pressed】+【click an inactive object】

CURRENT VERSION: Click once to activate the object Click twice to deselect.

SUGGESTION: Click once to cancel the selection and click twice to activate the object.

Reason 1: Consistent with the editing mode, changing the only difference from the editing mode, making it easier for beginners to adapt.

Reason 2: There is only one rule left for the operation of activating the object, that's the newly selected object is the active object, regardless of whether object selected.

Reason 3: The difference between light orange and dark orange is not obvious. Changing to a different color will destroy the overall sense of the selection set. By canceling the selection and then adding the selection, the activated object can be more obvious and the dependence on the color difference can be reduced.

Reason 4: Although activating the selected object requires one more click, because it can be double-clicked, it has little effect.

Reason 5: You need to click twice to reduce the selection, and it cannot be achieved by double-clicking in the current version (3.0 alpha) . You only need to click once after the change.

（Sorry for my bad english. I hope it does not affect understanding.）