Added UI elements for the new drawing system

Removed old gesture system
Refactored map interaction into separate component

src/components/map/controls/AlphaBlendToggle.js

@@ -0,0 +1,19 @@
+import React from "react";
+import { IconButton } from "theme-ui";
+
+import BlendOnIcon from "../../../icons/BlendOnIcon";
+import BlendOffIcon from "../../../icons/BlendOffIcon";
+
+function AlphaBlendToggle({ useBlending, onBlendingChange }) {
+  return (
+    <IconButton
+      aria-label={useBlending ? "Disable Blending" : "Enable Blending"}
+      title={useBlending ? "Disable Blending" : "Enable Blending"}
+      onClick={() => onBlendingChange(!useBlending)}
+    >
+      {useBlending ? <BlendOnIcon /> : <BlendOffIcon />}
+    </IconButton>
+  );
+}
+
+export default AlphaBlendToggle;