Reference fields (#3267)

* Adds a configurable 'reference pattern' to the IndexingReferenceMixin class

* Expand tests for reference_pattern validator:

- Prevent inclusion of illegal characters
- Prevent multiple groups of hash (#) characters
- Add unit tests

* Validator now checks for valid strftime formatter

* Adds build order reference pattern

* Adds function for creating a valid regex from the supplied pattern

- More unit tests
- Use it to validate BuildOrder reference field

* Refactoring the whole thing again - try using python string.format

* remove datetime-matcher from requirements.txt

* Add some more formatting helper functions

- Construct a regular expression from a format string
- Extract named values from a string, based on a format string

* Fix validator for build order reference field

* Adding unit tests for the new format string functionality

* Adds validation for reference fields

* Require the 'ref' format key as part of a valid reference pattern

* Extend format extraction to allow specification of integer groups

* Remove unused import

* Fix requirements

* Add method for generating the 'next' reference field for a model

* Fix function for generating next BuildOrder reference value

- A function is required as class methods cannot be used
- Simply wraps the existing class method

* Remove BUILDORDER_REFERENCE_REGEX setting

* Add unit test for build order reference field validation

* Adds unit testing for extracting integer values from a reference field

* Fix bugs from previous commit

* Add unit test for generation of default build order reference

* Add data migration for BuildOrder model

- Update reference field with old prefix
- Construct new pattern based on old prefix

* Adds unit test for data migration

- Check that the BuildOrder reference field is updated as expected

* Remove 'BUILDORDER_REFERENCE_PREFIX' setting

* Adds new setting for SalesOrder reference pattern

* Update method by which next reference value is generated

* Improved error handling in api_tester code

* Improve automated generation of order reference fields

- Handle potential errors
- Return previous reference if something goes wrong

* SalesOrder reference has now been updated also

- New reference pattern setting
- Updated default and validator for reference field
- Updated serializer and API
- Added unit tests

* Migrate the "PurchaseOrder" reference field to the new system

* Data migration for SalesOrder and PurchaseOrder reference fields

* Remove PURCHASEORDER_REFERENCE_PREFIX

* Remove references to SALESORDER_REFERENCE_PREFIX

* Re-add maximum value validation

* Bug fixes

* Improve algorithm for generating new reference

- Handle case where most recent reference does not conform to the reference pattern

* Fixes for 'order' unit tests

* Unit test fixes for order app

* More unit test fixes

* More unit test fixing

* Revert behaviour for "extract_int" clipping function

* Unit test value fix

* Prevent build order notification if we are importing records

InvenTree/build/fixtures/build.yaml

@@ -5,7 +5,7 @@
   fields:
     part: 100  # Build against part 100 "Bob"
     batch: 'B1'
-    reference: "0001"
+    reference: "BO-0001"
     title: 'Building 7 parts'
     quantity: 7
     notes: 'Some simple notes'
@@ -21,7 +21,7 @@
   pk: 2
   fields:
     part: 50
-    reference: "0002"
+    reference: "BO-0002"
     title: 'Making things'
     batch: 'B2'
     status: 40  # COMPLETE
@@ -37,7 +37,7 @@
   pk: 3
   fields:
     part: 50
-    reference: "0003"
+    reference: "BO-003"
     title: 'Making things'
     batch: 'B2'
     status: 40  # COMPLETE
@@ -53,7 +53,7 @@
   pk: 4
   fields:
     part: 50
-    reference: "0004"
+    reference: "BO-4"
     title: 'Making things'
     batch: 'B4'
     status: 40  # COMPLETE
@@ -69,7 +69,7 @@
   pk: 5
   fields:
     part: 25
-    reference: "0005"
+    reference: "BO-0005"
     title: "Building some Widgets"
     batch: "B10"
     status: 40 # Complete