Jiraone

Fixes:
- 🐛 An issue with JSON export that causes `None` type error which triggers an exception during extraction.

Updates:
- Made an update to the attributes in `Permissions` to align with the built-in Jira project and global permission module on cloud.

Fixes:
- 🐛 `get_all_sprints` API fix to query parameter 137
- 🐛 Corrected errors associated with the test script

Updates:
- Made some spelling corrections

Thanks to [huyz](https://github.com/huyz) for the below fixes and improvements to v0.8.4

Fixes:
- 🐛 `get_attachments_on_projects`: Overwrite attachment file by default
- 🐛 `json_field_builder`: check if `sprint_custom_id` is None
- 🐛 `path_builder`: handle multi-dir base_dir
- 🐛 `download_attachments`: avoid conflicts/overwrites by isolating attachments (helps with https://github.com/princenyeche/jiraone/issues/112)

Improvements:
- ✨ `download_attachments`: make defaults and behaviour match `get_attachments_on_projects`

Features:
- ✨ `download_attachments`: support `create_html_directors` option (resolves https://github.com/princenyeche/jiraone/issues/112)
- ✨ `download_attachments`: support `overwrite=False` option (to speed up incremental backups)

* Fixing the CSV change file type and merge_files to run without JQL
* Added a new endpoint to `runbackup`

* Minor fix to `process_executor` function with invalid arguments

Minor update 123
- Fix to issue reported on 124
- Corrected the documentation
- Minimized arguments on each method or function to max 5, then the rest are called via keyword arguments
- Added a new function for argument validation called `validate_argument_name`
- v0.8.0 and v0.8.1 are practically the same.