Generic Calendar View for all DocTypes

* added blank carbon copy

* [FEAT] BCC in emails

* removed test_communication, fixed comment

* fixed codacy

* use get for getting key

* PEP8 changes

- load_last_view
- refresh calendar view on route change

- get_events method
- show dropdown in list view
- save last calendar view

- watch js files
- add frappe.db.get_list in js

* - added ability to set JSBarcode options

* - codacy fix

* Update attach.js

* Add attach control styling to form.less

* Add margin

* [start] display barcode based on input

* [wip]

* [barcode] use set_value

* parse and set

* remove quagga

* [barcode] set in db

* [fix] set height

* cleanup

* remove from build.json, require instead

* [fix] declare JsBarcode global in .eslintrc

* enqueue_after_commit option added to frappe.enqueue

* Fixes

Codacy https://www.codacy.com/app/frappe/frappe/pullRequest?prid=934733
clear frappe.flags.enqueue_after_commit after executing enqueued jobs

* sync_global_search() uses enqueue_after_commit=True

* Update database.py

* webhooks enqueue after commit

* Update __init__.py

This code will fix fields style of the reports in RTL direction

* stream object should be BytesIO instead of StringIO

* Convert filter to list explicitly before checking length

* Decode sent_email and content before string operations

* Read image file in binary mode

* Read files in binary mode

* Don't use bytestrings unnecessarily

* Correctly convert byte strings to unicode in frappe.as_unicode

* Convert content to bytes before writing to file