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/ChangePasswordModal.js

@@ -0,0 +1,43 @@
+import Modal from 'flarum/components/Modal';
+
+/**
+ * The `ChangePasswordModal` component shows a modal dialog which allows the
+ * user to send themself a password reset email.
+ */
+export default class ChangePasswordModal extends Modal {
+  className() {
+    return 'modal-sm change-password-modal';
+  }
+
+  title() {
+    return 'Change Password';
+  }
+
+  content() {
+    return (
+      <div className="modal-body">
+        <div className="form-centered">
+          <p className="help-text">Click the button below and check your email for a link to change your password.</p>
+          <div className="form-group">
+            <button type="submit" className="btn btn-primary btn-block" disabled={this.loading}>Send Password Reset Email</button>
+          </div>
+        </div>
+      </div>
+    );
+  }
+
+  onsubmit(e) {
+    e.preventDefault();
+
+    this.loading = true;
+
+    app.request({
+      method: 'POST',
+      url: app.forum.attribute('apiUrl') + '/forgot',
+      data: {email: app.session.user.email()}
+    }).then(
+      () => this.hide(),
+      () => this.loading = false
+    );
+  }
+}