Refactor names; add Continuables dependency

[ReneSkukies]

This pull will add new functionality plus refactoring to the toolbox. Definitely breaking.

Will also need refactoring of the documentation.

[behinger]

• please list the breaking changes
• please make a better title, the PR title will appear e.g. in the release notes

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 0.00%. Comparing base (721fb69) to head (8608b59). Report is 4 commits behind head on dev.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #73 +/- ## ===================================== Coverage 0.00% 0.00% ===================================== Files 4 4 Lines 247 270 +23 ===================================== - Misses 247 270 +23 ```

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[behinger]

actually, this PR is not breaking right?

[ReneSkukies]

Breaking changes:

• function names have been changed to be Julia format-compatible

Additional changes

• data frames do not contain the root folder anymore
• loading is now done via continuables
• addition of coeftable
• better event loading and "unpack events" to get a tidy dataframe of all events
• user will only be warned if more than one session/task/run was found (in case nothing was provided)
• added some docstrings

Bug fix:

• there was a bug in loading hidden directories
• bug when trying to load raw files also loading derivatives

[behinger]

cool!

• Can you edit the Project.toml and remove Jan Haas (or did he do something in this project?)
• can you check all packages have compat entries? Probably remove the old Unfold ones ;)
• Documentation is failling (why is it twice there? weird)

if you have this, time to register I'd say!