Rockets, portals, collectibles & custom exits

New update contains 3 new elements 

• Portals - teleport the player from one place to another
• Rockets  - can either follow the player, or shoot straight to the players direction (can be adapted in custom attributes)
• Collectibles - optional objects, like coins, that can be placed in the level for the player to collect, for addtional challenge

Also, now it's possible to set multiple start and endpoints in a level, which allows to create exploreable worlds instead of linear platformers.