[Feature] Company Addresses (#4732)

* Add initial model structure

* Initial Address model defined

* Add migration and unit tests

* Initial migration for Address model generated

* Unit tests for Address model added

* Move address field to new model

* Added migration to move address field to Address model

* Implement address feature to backend

* API endpoints for list and detail implemented

* Serializer class for Address implemented

* Final migration to delete old address field from company added

* Tests for API and migrations added

* Amend migration file names

* Fix migration names in test

* Add address property to company model

* Iinital view and JS code

* Fix indents

* Fix different things

* Pre-emptive change before merge

* Post-merge fixes

* dotdotdot...

* ...

* iDots

* .

* .

* .

* Add form functionality and model checks

* Forms require a confirmation slider to be checked to submit
  if address is selected as primary

* Backend resets primary address before saving if new address
  is designated as primary

* Fix pre-save logic to enforce primary uniqueness

* Fix typos

* Sort out migrations

* Forgot one

* Add admin entry and small fixes

* Fix migration file name and dependency

* Update InvenTree/company/models.py

Co-authored-by: Matthias Mair <code@mjmair.com>

* Update InvenTree/company/models.py

Co-authored-by: Matthias Mair <code@mjmair.com>

* Correct final issues

* .

---------

Co-authored-by: Matthias Mair <code@mjmair.com>

docs/docs/order/company.md

@@ -43,6 +43,44 @@ The list of contacts associated with a particular company is available in the <s
 
 A *contact* can be assigned to orders, (such as [purchase orders](./purchase_order.md) or [sales orders](./sales_order.md)).
 
+### Addresses
+
+A company can have multiple registered addresses for use with all types of orders.
+An address is broken down to internationally recognised elements that are designed to allow for formatting an address according to user needs.
+Addresses are composed differently across the world, and Inventree reflects this by splitting addresses into components:
+- Line 1: Main street address
+- Line 2: Extra street address line
+- Postal Code: Also known as ZIP code, this is normally a number 3-5 digits in length
+- City: The city/region tied to the postal code
+- Province: The larger region the address is located in. Also known as State in the US
+- Country: Country the address is located in, written in CAPS
+
+Here are a couple of examples of how the address structure differs by country, but these components can construct a correctly formatted address for any given country.
+
+UK address format:
+Recipient
+Line 1
+Line 2
+City
+Postal Code
+Country
+
+US Address Format:
+Recipient
+Line 1
+Line 2
+City State Postal Code
+Country
+
+
+Addresses can be accessed by the <span class='badge inventree nav main'><span class='fas fa-map-marked'></span> Addresses</span> navigation tab.
+
+#### Primary Address
+
+Each company can have exactly one (1) primary address.
+This address is the default shown on the company profile, and the one that is automatically suggested when creating an order.
+Marking a new address as primary will remove the mark from the old primary address.
+
 ## Customers
 
 A *customer* is an external client to whom parts or services are sold.