Map.parse() is too complex

[tomato42]

https://github.com/ansasaki/symbol_version/blob/f441d3446bcb325df9a3ae440313d30da2646952/scripts/symbol_version.py#L226-L395

in general, I wonder if first splitting the file into sections for specific versions, and then parsing them wouldn't result in cleaner code

245: combination of strip() and startswith() seems like less heavy-handed approach (and more readable)

In general, I think a lot of the regex calls could be replaced by find(), startswith() or split()

246: comparison to None, in general it should be is not None, in this case it should be just if m: