Implement anchor and handle point rendering with the Path Tool (#353)

* Implement Path Tool

* Draw a red rectangle where the first point on the shape is

* Correctly render anchors, handles, and connecting lines

* Fix drain() which can panic

* Refactor frontend messages to work as return values not callbacks

* Reduce the number of unnecessary frontend updates

* Fix stack overflow by using a loop

* Group Document Render calls and put them at the end

* Speed hacks for dirtification

* Add performance

* Bunch folder changed updates

* Add triggers to redraw overlays to movement_handler

* Polish the pixel-perfect rendering of vector manipulators

* Restore scrollbars that were disabled

* Cleanup

* WIP Add shape outline rendering

* Fix compiling

* Add outlines to selected shapes

* Fix outlines rendering over handles and anchors

* Fix dirtification

* Add a comment

* Address code review feedback

* Formatting

* Small tweaks

Co-authored-by: Oliver Davies <oliver@psyfer.io>
Co-authored-by: Dennis Kobert <dennis@kobert.dev>

frontend/src/components/panels/Document.vue

@@ -91,7 +91,7 @@
 
 					<Separator :type="SeparatorType.Section" :direction="SeparatorDirection.Vertical" />
 
-					<ShelfItemInput icon="VectorPathTool" title="Path Tool (A)" :active="activeTool === 'Path'" :action="() => comingSoon(82) && selectTool('Path')" />
+					<ShelfItemInput icon="VectorPathTool" title="Path Tool (A)" :active="activeTool === 'Path'" :action="() => selectTool('Path')" />
 					<ShelfItemInput icon="VectorPenTool" title="Pen Tool (P)" :active="activeTool === 'Pen'" :action="() => selectTool('Pen')" />
 					<ShelfItemInput icon="VectorFreehandTool" title="Freehand Tool (N)" :active="activeTool === 'Freehand'" :action="() => comingSoon() && selectTool('Freehand')" />
 					<ShelfItemInput icon="VectorSplineTool" title="Spline Tool" :active="activeTool === 'Spline'" :action="() => comingSoon() && selectTool('Spline')" />