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Skip empty scopes when quoting

Right now this code

describe! {
	case "one" {
		case "two" {
			case "three" {
				assert!(true);
			}
		}
	}
}

expands to

mod one {
	use super::*;

	mod two {
		use super::*;

		#[test]
		fn three() {
			{ { { { assert!(true); } } } }
		}
	}
}

Ideally we'd want

mod one {
	use super::*;

	mod two {
		use super::*;

		#[test]
		fn three() {
			assert!(true);
		}
	}
}

Feature: Case enumeration

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

Feature: Pretty messages

Catch does this

Scenario: vectors can be sized and resized
     Given: A vector with some items
      When: more capacity is reserved
      Then: the capacity changes but not the size

catchr will show you the path to the test, but paths cannot contain any special characters. It'd be nice to be able to do something like:

section "Very descriptive comment" {
	case "-- special chars ???" {
		assert!(false, catchr_msg!());
	}
}

and for it to output:

running 1 test
test very_descriptive_comment::special_chars ... FAILED

failures:

---- very_descriptive_comment::special_chars stdout ----
thread 'very_descriptive_comment::special_chars' panicked at '
Section: Very descriptive comment
	Case: -- special chars ???
', src/lib.rs:4:9

or something simmilar

Testing async-infected code

Currently the catchr uses #[test] to mark tests.

Which is good for usual tests, but async is so contagious that even tests are affected.

For async code (with tokio in my case) common way is to use #[tokio::test] instead of #[test] (and other runtimes have similar, eg actix_rt::test).

Can we have support for that?

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