Improve Pen tool handle dragging with Tab swapping, Ctrl angle locking, and directly dragging the closing endpoint in handle (#2452)

* added handle_types and refactored the handle_adjustments

* anchor move refactor

* code-todo-fix

* removed-draw-mode

* kind of works need to figure out snapping

* some refactoring

* refactor+overlays..need to fix the snapping and dragging

* added docs

* got stuck in space move

* fixed all issues

* comments and small fixes

* completed last issue and refactor

* major fixes and improv

* fixed edge cases

* edge cases fixed

* fix edge cases and add docs

* Code review pass

* rename ,bug fixes

* Add terminology diagram

* Add Ctrl "Lock Angle" hint

* Rename other hint

---------

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

editor/src/messages/input_mapper/input_mappings.rs

@@ -254,6 +254,7 @@ pub fn input_mappings() -> Mapping {
 		//
 		// PenToolMessage
 		entry!(PointerMove; refresh_keys=[Control, Alt, Shift, KeyC], action_dispatch=PenToolMessage::PointerMove { snap_angle: Shift, break_handle: Alt, lock_angle: Control, colinear: KeyC, move_anchor_with_handles: Space }),
+		entry!(KeyDownNoRepeat(Tab); action_dispatch=PenToolMessage::SwapHandles),
 		entry!(KeyDown(MouseLeft); action_dispatch=PenToolMessage::DragStart { append_to_selected: Shift }),
 		entry!(KeyUp(MouseLeft); action_dispatch=PenToolMessage::DragStop),
 		entry!(KeyDown(MouseRight); action_dispatch=PenToolMessage::Abort),