Thumbnail upload and debug hotkeys added in the Commando2 Steam WorkShop — Commando Collection Steam update #951057

The details of this update are as follows: 1. The success of Workshop items heavily relies on having a high-quality thumbnail. This update adds a thumbnail upload feature. The 'Thumbnail' button is located to the left of 'Upload Update.' For players who have already published items in the Workshop, it's time to wake up and update your thumbnails! 2. Added debugging features to facilitate testing your creations in the Workshop: Press Z to display terrain, X to hide terrain, and C to skip levels. 3, Added the preview of the level editing.