Bezier-rs: Add joins and caps to offsets and outlines (#1083)

* Intial work

* Improve miter and add round join

* Get arcs to go opposite direction

* Add cap and other refactors

* Rename joint to join, fix some bugs

* Fix single point issue

* Clean up

* Fix iframe sizes and update UI

* Address comments and handle single point outline

* Rename variables, fix branches in outline

* Address comments

website/other/bezier-rs-demos/src/utils/render.ts

@@ -43,6 +43,10 @@ export function renderDemo(demo: Demo): void {
 				selectInput.append(option);
 			});
 
+			if (inputOption.disabled) {
+				selectInput.disabled = true;
+			}
+
 			selectInput.addEventListener("change", (event: Event): void => {
 				demo.sliderData[inputOption.variable] = Number((event.target as HTMLInputElement).value);
 				demo.drawDemo(figure);