Labedf

This update clarifies the purpose of this library (merging lab.js CSV and EDF files).
Excessive functions have been removed.

Changes
+ Remove set2, edf2 modules
+ Rename csv2.merge_csv2edf to edf_csv.merge_edf_csv

+ .set(EEGLAB) files support.
+ [add option not to write time in annotations(csv2.merge_csv2edf)](https://github.com/s-n-1-0/labedf.py/commit/840948ccf6cec3233280ce52eb0c60d1213bb774)
+ [update install_requires](https://github.com/s-n-1-0/labedf.py/commit/f117e81df268a7937ccf558eae3fe17881c5caf2)

Changes
+ [fix: end_marker_offset not working when marker_names are multiple.](https://github.com/s-n-1-0/labedf.py/commit/a7d2ce16133b183135390d09c333956d1a6890cb)
+ [add the option to set minimum signal size when creating a dataset (edf2.split_annotations_edf2hdf)](https://github.com/s-n-1-0/labedf.py/commit/1f7e0831842592fd7861b4ae266e835574de9ae3)
+ [add start point offset option](https://github.com/s-n-1-0/labedf.py/commit/ac9127617d8fca25e2dacb12b8e46e0416261f1d)

+ [support for multiple marker_name (csv2.merge_csv2edf)](https://github.com/s-n-1-0/labedf.py/commit/800371294c65001b7bf1ca821b8cbdd548a62e13)

Changes
+ [add label filter option (edf2.split_annotations_edf2hdf)](https://github.com/s-n-1-0/labedf.py/commit/19b0020bb515039e9ed28e9b14e559168f423d89)
+ [change filter option (edf2.split_annotations_edf2hdf)](https://github.com/s-n-1-0/labedf.py/commit/9f424595f4fd8a6ff8e0a6923247f4ab64336945)
- filters(str) -> annotation_filter_func(function)

Changes

- edf2.split_annotations_edf2hdf
- [add "label" argument to after_preprocessing_func option](https://github.com/s-n-1-0/labedf.py/commit/0b769e4697ec292868c814193f07a7f47b55208e)
- [fix: after_preprocessing_func option is not working](https://github.com/s-n-1-0/labedf.py/commit/bf860871003d30634039e51c32003f642f560c93)