Massive JavaScript cleanup

- Use JSX for templates
- Docblock/comment everything
- Mostly passes ESLint (still some work to do)
- Lots of renaming, refactoring, etc.

CSS hasn't been updated yet.

js/forum/src/components/ForgotPasswordModal.js

@@ -0,0 +1,99 @@
+import Modal from 'flarum/components/Modal';
+import Alert from 'flarum/components/Alert';
+
+/**
+ * The `ForgotPasswordModal` component displays a modal which allows the user to
+ * enter their email address and request a link to reset their password.
+ *
+ * ### Props
+ *
+ * - `email`
+ */
+export default class ForgotPasswordModal extends Modal {
+  constructor(...args) {
+    super(...args);
+
+    /**
+     * The value of the email input.
+     *
+     * @type {Function}
+     */
+    this.email = m.prop(this.props.email || '');
+
+    /**
+     * Whether or not the password reset email was sent successfully.
+     *
+     * @type {Boolean}
+     */
+    this.success = false;
+  }
+
+  className() {
+    return 'modal-sm forgot-password';
+  }
+
+  title() {
+    return 'Forgot Password';
+  }
+
+  body() {
+    if (this.success) {
+      const emailProviderName = this.email().split('@')[1];
+
+      return (
+        <div className="form-centered">
+          <p className="help-text">We've sent you an email containing a link to reset your password. Check your spam folder if you don't receive it within the next minute or two.</p>
+          <div className="form-group">
+            <a href={'http://' + emailProviderName} className="btn btn-primary btn-block">Go to {emailProviderName}</a>
+          </div>
+        </div>
+      );
+    }
+
+    return (
+      <div className="form-centered">
+        <p className="help-text">Enter your email address and we will send you a link to reset your password.</p>
+        <div className="form-group">
+          <input className="form-control" name="email" type="email" placeholder="Email"
+            value={this.email()}
+            onchange={m.withAttr('value', this.email)}
+            disabled={this.loading} />
+        </div>
+        <div className="form-group">
+          <button type="submit" className="btn btn-primary btn-block" disabled={this.loading}>
+            Recover Password
+          </button>
+        </div>
+      </div>
+    );
+  }
+
+  onsubmit(e) {
+    e.preventDefault();
+
+    this.loading = true;
+
+    app.request({
+      method: 'POST',
+      url: app.forum.attribute('apiUrl') + '/forgot',
+      data: {email: this.email()},
+      handlers: {
+        404: () => {
+          this.alert = new Alert({type: 'warning', message: 'That email wasn\'t found in our database.'});
+          throw new Error();
+        }
+      }
+    }).then(
+      () => {
+        this.loading = false;
+        this.success = true;
+        this.alert = null;
+        m.redraw();
+      },
+      response => {
+        this.loading = false;
+        this.handleErrors(response.errors);
+      }
+    );
+  }
+}