Feed additional types in typesystem

[alem0lars]

Add the following types:

• date
• time
• datetime
• list, available as:
  • raw: type of list's elements is unspecified
  • generics: ability to specify types of list's elements
• hash (meant as dictionary), available as:
  • raw: type of hash's keys/values is unspecified
  • generics: ability to specify types of hash's keys/elements

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