Add support for vorapis v3

Based on patch by @ten4dinosaur

src/utils/compatibility.ts

@@ -12,4 +12,8 @@ export function runCompatibilityChecks() {
             Config.config.showZoomToFillError2 = false;
         }, 10000);
     }
+}
+
+export function isVorapisInstalled() {
+    return document.querySelector(`.v3`);
 }