Add fallback to bcryptjs, make canvas optional

src/plugins/PluginIndex.ts

@@ -1,5 +1,6 @@
+import { Plugin } from "util/plugin";
 import * as example_plugin from "./example-plugin/TestPlugin";
 
 export const PluginIndex: any = {
-	"example-plugin": new example_plugin.default()
-};
+    "example-plugin": new example_plugin.default(),
+};