* Add field for client_secret in Oauth Client Doctype

* openid_profile endpoint in oauth2.py

* added stub methods for OpenID Connect in RequestValidator

* [Fix] using werkzeug url_fix on uri

* added 3 oidc methods in RequestValidator

* Added Frappe Section in Social Login Keys

Add section in `Social Login Keys` for fields `Frappe Client ID` and `Frappe Client Secret` and additional field Frappe OAuth 2 Server because github, facebook and google have fixed urls, Frappe server URL can change as per the hosting domain/server/company

* [Fix] accept code id_token param for oidc

* generate id_token jwt alg HS256

* Updates to OAuth 2 and OIDC

`OAuth Authorization Code` and `OAuth Bearer Token` DocType made RO
Delete Invalid Codes and Revoked Tokens periodically
generate and send `id_token` only if scope of token is `openid`

* [Fix] Periodically delete revoked tokens

* Social Logins untested

* Enabled Frappe social login

* [Docs] OpenID Connect and Frappe social login

* [Fix] Allow multiple scopes for OAuth 2

* [Docs] Added screenshot steps to configure openid and frappe social login

* saved doctype to solve merge conflict

* [fix] re-added client_secret after resolving merge conlict

* [Fix] frappe_userid and default scope

* [minor] added default standard filters

* [fix] frappe.sendmail

* [fix] frappe.sendmail

Reorganise footer links

[typo] uncatagorised → uncategorised

* Fixes issues with old branch

* [fixes] remember totals row option and calculate in the browser if possible

[Fix] Set default backup limit for sites which are not set

[fix] email alert message changed to Code and ignore xss filtering

What we are trying to solve is we want to send a link that will redirect to a doctype for ex. http://localhost:8000/login?redirect-to=/Purchase%20Invoice/PINV-00006 this link should redirect the user to the doctype purchase invoice, but will ask for password first. What we failed to do is it should not ask the user to log in if the user is already logged in. But changing the link to http://localhost:8000/desk?redirect-to=/Purchase%20Invoice/PINV-00006 it will directly go to the invoice, but the problem is if the user is not logged in it will go to 403 page, but if the user will log in it will redirect the user to desk not to the invoice.

Steps to Reproduce the Problem
1. get a 'direct link' ex. http://localhost:8000/desk?redirect-to=/Purchase%20Invoice/PINV-00006
2. go to link 'direct link'
3. it will ask you to login
4. login successfully but it will just go to desk not to the invoice
5. get a direct link ex. http://localhost:8000/login?redirect-to=/Purchase%20Invoice/PINV-00006
6. go to the link
7. it will go to the invoice or any doctype

[fix] email alert message changed to Code and ignore xss filtering

Fix doc indicator based on standard fields

Fix 'engine' attribute error

[path][fix] paypal integration

[ui] z-index fix and filter-dashboard css cleanup

z-index fix