Feature: Case enumeration

[Dzejkop]

Syntax:

section "whatever" {
  each msg in ["Hello", "World"] {
    then "should be true" { 
      assert!(false, msg);
    }
  }
}

Should expand into

mod section_whatever {
    use super::*;
    
    mod msg_is_hello {
        use super::*;
        
        #[test]
        fn then_should_be_true() {
			{
            	let msg = "Hello";
            	assert!(false, msg);
			}
        }
    }
    
    mod msg_is_world {
        use super::*;
        
        #[test]
        fn then_should_be_true() {
            { 
                let msg = "World";
                assert!(false, msg);
            }
        }
    }
}

Notes:

1. in each item in items item should be a pattern and items a list of pattern.
2. item should inserted as the first item in the respective scope