Reorganize project. Add folder for shared code between backend/dashboard. Switch from jest to ava for tests.

backend/src/PluginRuntimeError.ts

@@ -0,0 +1,21 @@
+import util from "util";
+
+export class PluginRuntimeError {
+  public message: string;
+  public pluginName: string;
+  public guildId: string;
+
+  constructor(message: string, pluginName: string, guildId: string) {
+    this.message = message;
+    this.pluginName = pluginName;
+    this.guildId = guildId;
+  }
+
+  [util.inspect.custom](depth?, options?) {
+    return `PRE [${this.pluginName}] [${this.guildId}] ${this.message}`;
+  }
+
+  toString() {
+    return this[util.inspect.custom]();
+  }
+}