v7.4.0

changelog:

• added 1 theme
• added 1 special material
• added 1 decoration
• (almost) all physics objects can now be duplicated
• added a property to the control seat to not let the player exit it on jump
• some level properties now display better and can be changed faster
• pinned objects now display a bolt that shows where they were pinned
• added 1 missing theme to the theme changer
• updated the link to the skin template
• bug fixes