1.5.1

• Add implicit detail/smoothing, color/texture, position/orientation/size and font options to custom blocks
• Logical and/or expressions now short circuit (don't evaluate their second parameter unless needed)
• Added support for creating MaterialProperty from SCNMaterials using NS/UIImage
• Fixed setting camera position on locked documents (such as the Example projects)
• Added slightly stronger type safety when calling commands
• Fixed axes contrast when using per-camera backgrounds
• Fixed font inheritance for user-defined blocks
• Added custom fonts to model info display
• Added USDZ to list of supported export types
• Improved iOS compatibility