[hotfix] Not able to export general ledger report's data in excel

* Add get_source_value to utils, and use it to get value from object or dict

* GitHub connector

* fix codacy

* remove print statement

* Remove Github Connector

* Data Migration Connector

- Create new connection with boilerplate
- Add Run button in Data Migration Plan

* minor

* fix codacy

* remove pygithub

* Minor

- Remove button from form and add to custom button
- Remove is_custom field
- Add Connector Type 'Custom'
- Show New Connection button only in developer mode

* [fix] logging

- only store the name, not the whole json

* [fix] tests

* Save domain settings to create related custom fields for already enabled domain

* Remove all domains from active domains after running test cases

* [hotfix] delete and sync the child table customization

* Update utils.py

[Fix] Don't show upgrade button for paid site

[HOTFIX] translate domain

* use get for getting key

* PEP8 changes

* - added ability to set JSBarcode options

* - codacy fix