Modifier and ModifierProvider classes added to the compilation.
Utility function to convert single values to arrays.
Modifier reference is now part of the Engine class.
Asset class describes its modifiers.
Asset class describes its modifiers.
Engine now uses the modifierProvider.
Dummy code removed
Fixed reference for the "rectangle" zone.
Fixed reference to "circle" zone.
Added classes for modifiers.
Updated according to modifiers implementation.