Fix invalid parsing of the bool arguments

[mic4ael]

This MR aims to fix the a couple of issues in the argument parsing:

1. InvertedSetting incorrectly defines its own __get__ and __set__ dunder methods.
2. Boolean arguments are not properly initialized.
3. daemonize is missing typeconv setting.

I have found all these issues (and a few more) while trying to deploy pyff on our infra at CERN.

All Submissions:

• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you added an explanation of what problem you are trying to solve with this PR?
• Have you added information on what your changes do and why you chose this as your solution?
• Have you written new tests for your changes?
• Does your submission pass tests?
• This project follows PEP8 style guide. Have you run your code against the 'flake8' linter?

[mic4ael]

I would be really happy if you could apply the hacktoberfest-accepted label to this MR if you find it valuable and decide to merge it.

[mikaelfrykholm]

This crashes in production because of memory issues. Will try to reproduce.

[mic4ael]

This crashes in production because of memory issues. Will try to reproduce.

Interesting.. These changes lead to memory issues?

[mikaelfrykholm]

no, sorry, I spoke to Hanna and this was sort of a mental note to me that they(/you) have issued with daemon mode and leaking memory.

[mic4ael]

Ah, ok. That is correct.