Co-authored-by: Frappe Bot <developers@frappe.io>

`key: ['value', 'value2']` is turned into `key: 'value'` for no reason

- To accept argument via both way in a single request

The license.txt file has been replaced with LICENSE for quite a while
now. INAL but it didn't seem accurate to say "hey, checkout license.txt
although there's no such file". Apart from this, there were
inconsistencies in the headers altogether...this change brings
consistency.

* Remove six for PY2 compatability since our dependencies are not, PY2
  is legacy.
* Removed usages of utils from future/past libraries since they are
  deprecated. This includes 'from __future__ ...' and 'from past...'
  statements.
* Removed compatibility imports for PY2, switched from six imports to
  standard library imports.
* Removed utils code blocks that handle operations depending on PY2/3
  versions.
* Removed 'from __future__ ...' lines from templates/code generators
* Used PY3 syntaxes in place of PY2 compatible blocks. eg: metaclass

(cherry picked from commit e288b781bf)

(cherry picked from commit b214a993da)

If header 'Accept: application/json' isn't set, the failure
responses to /api endpoints is HTML. Success responses are of type JSON.

(cherry picked from commit fcf63622bc)

If header 'Accept: application/json' isn't set, the failure
responses to /api endpoints is HTML. Success responses are of type JSON.

(cherry picked from commit fcf63622bc)

If header 'Accept: application/json' isn't set, the failure
responses to /api endpoints is HTML. Success responses are of type JSON.

we are setting admin as current user, At time of request handling if
frappe.db is not set. fixed that issue by adding a check.

(cherry picked from commit 68c6fc4a44)

Co-authored-by: Sagar Vora <sagar@resilient.tech>

Co-authored-by: Suraj Shetty <13928957+surajshetty3416@users.noreply.github.com>

(cherry picked from commit 4b93f75eba)

(cherry picked from commit 1345c2feb3)

(cherry picked from commit 476e625261)

conflict with web.log file generated by gunicorn process in production

Signed-off-by: Chinmay D. Pai <chinmaydpai@gmail.com>

Do not collect request headers
Collect job wait time and whether it was scheduled

Collect HTTP Request and Background Job logs

* move all werkzeug.wsgi and werkzeug.contrib imports to
  werkzeug.middleware to make things work.
* update pinned requirement to 1.0.0

Signed-off-by: Chinmay D. Pai <chinmaydpai@gmail.com>