Smart loading order and preload strategy

To prevent extreme loading times on complex tours, it would be crucial to implement some kind of intelligent loading strategies, i. e. loading the first scene first, the hotspot icons second, the hotspot contents third and then move on to the immediately linked scences. Look into existing libraries like Preload.js (https://createjs.com/preloadjs) for that, no need to reinvent.

Implemented Asset Preloading Order

• Hotspot Icons: Always preload first (one-time and very quick)
• Mediapage Assets: Preload home mediapage (one-time)
• Hotspot Assets: Preload all assets used in any hotspot in current mediapage
• Linked Mediapage Assets: Preload every directly linked mediapage