- Can be set using a field (Event)
- Can be set using custom logic (see sales_order_calendar.js)

- frappe/erpnext#8353

* - Add controller for signature field, including buttons for save and reset
- Add library and style

* Add DB mapping for Signature field -> fix bug not saving
Add empty image, and auto load image when loading form
Add option for Signature field type on Doctype form

* Make field uneditable after submitting

* Remove console log and revert adding empty lines

* Update layout, remove edit mode/button, make save button compact. Refactor and use change event to trigger save.

* [cleanup] Signature Control

* Refactored LinkedWith

* Added new class syntax

* minor

* Allow multiple file upload, show progress while uploading

* Enhance multi file upload

You can now upload files programmatically like
```
frappe.upload.make({
  ...
  files: fileobj_array,
  ...
})
```
No need to use `multifile_upload` method.
Multiple file upload is enabled by default on all Attach dialogs.

* Don't `allow_multiple` in data import tool

* ControlAttach don't allow_multiple

* Show files in a table view

* Narrow width for Is Private column

* [fix] setting page for stripe

* checkout flow for stripe payment

* controller to handle stripe checkout and authorization

* Export indentation as per tree report

* Export indentation as per tree report fixed tabs and hardcoded

* make report results ltr to work with SlickGrid

* Update report-rtl.css

[minor][fix] parameter naming fix

Validate last_view before saving

List View fixes

Correction of the currency format for France

Changed custom_script.json to remove script from list view

Removed Script text from list view since it leads to a visual error.

* [start] basic sidebar function

* remove flicker on fetch

* use promises for global and help results

* add summary view

* single modal, sidebar keyboard selection

* Placeholder and no_results state, result render prep

* Specific empty states, results template no longer special: thus remove reset(), forum results trial

* Add loading state

* more results working

* commonify more results, added images

* All nav results in modal, with recents

* use common utils in awesome bar

* UI fixes

* Remove forum results

* frappe/erpnext#8222 frappe/erpnext#8264

List View HTML Refactor

- Used BEM naming for flat css classes

[minor] fixes in feedback trigger, and feedback web page

[minor] minor fixes in email_account and added has_attachment in comm…