Add selection cycle and gray pre-selection outlines to the Path tool, and Tab to swap Select/Path tools (#2818)

* Added initial version of this feature for the path tool

* Removed debug statements

* Thickened the overlay width

* Added hover highlighting for path tool

* Experimental switch to path tool at leaf layer

* Ghost outline initial implementation

* Added tab swap for select tool -> path tool

* Minor fix for Select Tool dbl click -> Path Tool

* Added support for ghosts when using GRS in the path tool

* Fixed GRS undo bug, vastly improved hover behavior and now clearly visualize next double click target

* Fixed unused import warnings

* Updated behavior to handle mouse movement cases, reverted line width to 1px

* Fixed merge behavioral issues

* Disabled Select Tool to Path Tool double click toggle, fixed single click drill through for special case

* Clean up of unused consts and comment

* Properly cancel the drill through state when the mouse moves

* Fix some stuff

---------

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

editor/src/messages/input_mapper/input_mappings.rs

@@ -317,6 +317,7 @@ pub fn input_mappings() -> Mapping {
 		entry!(KeyDown(KeyX); modifiers=[Shift], action_dispatch=ToolMessage::SwapColors),
 		entry!(KeyDown(KeyC); modifiers=[Alt], action_dispatch=ToolMessage::SelectRandomWorkingColor { primary: true }),
 		entry!(KeyDown(KeyC); modifiers=[Alt, Shift], action_dispatch=ToolMessage::SelectRandomWorkingColor { primary: false }),
+		entry!(KeyDownNoRepeat(Tab); action_dispatch=ToolMessage::ToggleSelectVsPath),
 		//
 		// DocumentMessage
 		entry!(KeyDown(Space); modifiers=[Control], action_dispatch=DocumentMessage::GraphViewOverlayToggle),