Use TOML as default storage

[markus2330]

The current default format "dump" is not suitable to be edited by hand (e.g. by using kdb editor), which is a usability problem. To improve the situation, YAML can be used. The new storage plugin should fulfill following properties (ordered by priority):

1. it should round-trip (if a KeySet is serialized and then parsed again, we end up with an identical internal representation)
2. drop-in replacement as default storage plugin even if user still has some dump files lying around (something like dini is needed)
3. user efforts in manually crafting the file are not lost (comments, ordering, ...)
4. source code is maintainable (grammar-based,...) and modular (parsing, generation, ... separated)
5. good error messages for typical mistakes
6. good documentation of the format (and grammar for formal definition)
7. line number information is kept linenumbers for validation #736

Tasks:

• migrate internal documentation to YAML src/error/specification to INI #1115
• run fuzzer try out AFL #185

[markus2330]

@bauhaus93 What is the current status?

[stale]

I mark this issue stale as it did not have any activity for one year. I'll close it in two weeks if no further activity occurs. If you want it to be alive again, ping the issue by writing a message here or create a new issue with the remainder of this issue.
Thank you for your contributions 💖

[stale]

I closed this issue now because it has been inactive for more than one year. If I closed it by mistake, please do not hesitate to reopen it or create a new issue with the remainder of this issue.
Thank you for your contributions 💖