Expycted

Fixes
- 🐛Reset negated state. Closes 32 by bdsoha

Changes:
- Fixed *persistent negation* in *chained expectations*

Author: bdsoha

:warning: __BREAKING CHANGES__ :warning:

Changes:
- changed wording in expectations towards `expected` - `actual` (__BREAKS__ potential keyword usage of matchers in versions `<0.8`)
- added expectation chaining (`.and_to`, `.and_not_to`/`.and_not`)
- added support for `Path` objects in filesystem matchers

Author: bdsoha

Changes:
- Hidden internal traces
- Updated documentation

Authored by: bdsoha

Changes:
- Updated `.to` and `.to_not` to lazy load

Authored by: bdsoha

Changes:
- Clearer assertion errors
- Refactor to be less verbose