python3-flexparser - 0.4-1 main

The idea behind flexparser is quite simple. To write a class for every
type of content (called here `ParsedStatement`) one needs to parse.
Each class have a `from_string` constructor.
The `typing` module is used extensively to make the output structure
easy to use and less error prone.
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The fuse of frozen dataclass is not necessary but it convenient.
Being a dataclass you get the init, str, repr, etc for free.
Being frozen, sort of immutable, makes them easier to reason around.
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The result is a collection of `ParsedStatement` or `ParsingError`.