3.0.0-alpha.7

• Refactored parsing logic into individual subclass methods
• Eliminated ZodTypes to enable custom ZodType subclasses
• Removed ZodIntersection
• Added ZodEffects as a container for refinement and transform logic
• Added or method to ZodType
• Added format method to ZodError
• Added unwrap method to ZodOptional and ZodNullable
• Added new default method and moved default functionality into ZodOptional
• Implemented z.setErrorMap
• Exporting z variable from index.ts to enable import { z } from 'zod';