Add Deepest and Shallowest selection to the Select tool (#1016)

* Single-clicking shape now selects the parent folder

* Added Ratio Button for Layer/Group. Task 1 Done

* All 3 bullet points been checked.Needs refactoring

* Refactored Code + Added descriptive comments

* Reduced code, removed comments, moved/renamed enum

* Hints now change based on selection behavior

* refactored updating hints based on layer behavior

* Updated hints and shift click for shallow select

* fixed cargo check warnings

* shift deselect works. Checking for edge cases

* Fixed the first 5 bullet points suggestions.

* Fixed double click issue

* Double click on shape switches to path tool

* updated deepest select and its hints

* Reworked logic for single click for shallow select

* Fixed CargoCheck warnings + Hypercube suggestions.

* Fix append -> push

* Break out two functions

* Split out big code blocks into functions

* Edit hint text

* Assorted code quality cleanup

* Combine duplicate impl blocks

* Add todo for future code cleanup

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Co-authored-by: Keavon Chambers <keavon@keavon.com>

editor/src/messages/input_mapper/default_mapping.rs

@@ -60,7 +60,7 @@ pub fn default_mapping() -> Mapping {
 		//
 		// SelectToolMessage
 		entry!(PointerMove; refresh_keys=[Control, Shift, Alt], action_dispatch=SelectToolMessage::PointerMove { axis_align: Shift, snap_angle: Control, center: Alt, duplicate: Alt }),
-		entry!(KeyDown(Lmb); action_dispatch=SelectToolMessage::DragStart { add_to_selection: Shift }),
+		entry!(KeyDown(Lmb); action_dispatch=SelectToolMessage::DragStart { add_to_selection: Shift, select_deepest: Accel }),
 		entry!(KeyUp(Lmb); action_dispatch=SelectToolMessage::DragStop { remove_from_selection: Shift }),
 		entry!(KeyDown(Enter); action_dispatch=SelectToolMessage::Enter),
 		entry!(DoubleClick; action_dispatch=SelectToolMessage::EditLayer),