Class Validate

Some validators which system provided:

• schema: Validate object schema
• length: Validate length of array or string
• match: Validate object must be match target
• in: Validate object must be in targets

- Vars:
    obj: [1,2,3,4]

- Validate:
    title: Validate object schema which use builtin system
    func: schema
    args: 
      - ${obj}
      - { "type": "array" }