EGO-L-002 warning

objects created by extension should be destroyed in disable()

Objects assigned in `enable()` are missing matching `.destroy()` calls in `disable()` or its helper methods.

Destroy all objects

• extension.js:224

          this._detailLabel = new St.Label({
              text: '—',
              style_class: 'zeo-ring-detail',
              x_align: Clutter.ActorAlign.CENTER,
          })

• extension.js:188

          this._drawingArea = new St.DrawingArea({
              width: RING_SIZE,
              height: RING_SIZE,
          })

• extension.js:217

          this._nameLabel = new St.Label({
              text: label,
              style_class: 'zeo-ring-name',
              x_align: Clutter.ActorAlign.CENTER,
          })

• extension.js:200

          this._pctLabel = new St.Label({
              text: '0%',
              style_class: 'zeo-ring-pct',
              x_align: Clutter.ActorAlign.CENTER,
              y_align: Clutter.ActorAlign.CENTER,
          })