Kintree

* Refactored part creation process
- User part form is always displayed before categories
- Custom part follows same flow as part search (except the user part form is pre-filled)
- Renamed methods involved in translating data from supplier to form to inventree
- A lot cleaner! (disclaimer: possible :bug:)
* Fixed bug in loading subcategories from `categories.yaml`

* Added user mapping for Digi-Key search keys (see 51)
* Added ability to select supplier for search
* Added LCSC API support (see 52)
* Cleaned-up fields labels across GUI

> Note: GUI version still shows 0.4.0...

Released to PyPI! (No new feature)

>> [Check it out!](https://pypi.org/project/kintree/) <<

`pip install kintree` Yay!

Updates

* All the dependencies are installed from PyPI instead of relying on submodules
* There is a new settings menu for user configuration (Under "Settings > User"):


Details below:
> Those paths are telling Ki-nTree where all the user configuration files are stored, instead of being hard-coded. By default the configuration files are created in the user's home folder. The path to the configuration and cache files can be changed and they are stored in a `settings.yaml` file also located user's home folder (in `kintree` folder).

No new feature!

* Code base is now PEP compliant
* Switched from Travis CI to Github Actions

Updates

* Fixed build issue which was omitting `settings` folder
* Fixed part URL when missing slash was missing from InvenTree base URL
* Ensure parameters comparison when they exist for both database and new part
* Fix for building and running EXE in Windows