[MIG] base_import_match: Migration to 12.0

[UPD] README.rst

[UPD] Update base_import_match.pot

base_import_match/readme/CONFIGURE.rst

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+To configure this module, you need to:
+
+#. Go to *Settings > Technical > Database Structure > Import Match*.
+#. *Create*.
+#. Choose a *Model*.
+#. Choose the *Fields* that conform a unique key in that model.
+#. If the rule must be used only for certain imported values, check
+   *Conditional* and enter the **exact string** that is going to be imported
+   in *Imported value*.
+
+   #. Keep in mind that the match here is evaluated as a case sensitive
+      **text string** always. If you enter e.g. ``True``, it will match that
+      string, but will not match ``1`` or ``true``.
+#. *Save*.
+
+In that list view, you can sort rules by drag and drop.

base_import_match/readme/CONTRIBUTORS.rst

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+* `Tecnativa <https://www.tecnativa.com>`_:
+  * Jairo Llopis
+  * Vicent Cubells
+  * Ernesto Tejeda

base_import_match/readme/DESCRIPTION.rst

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+By default, when importing data (like CSV import) with the ``base_import``
+module, Odoo follows this rule:
+
+- If you import the XMLID of a record, make an **update**.
+- If you do not, **create** a new record.
+
+This module allows you to set additional rules to match if a given import is an
+update or a new record.
+
+This is useful when you need to sync heterogeneous databases, and the field you
+use to match records in those databases with Odoo's is not the XMLID but the
+name, VAT, email, etc.
+
+After installing this module, the import logic will be changed to:
+
+- If you import the XMLID of a record, make an **update**.
+- If you do not:
+
+  - If there are import match rules for the model you are importing:
+
+    - Discard the rules that require fields you are not importing.
+    - Traverse the remaining rules one by one in order to find a match in the database.
+
+      - Skip the rule if it requires a special condition that is not
+        satisfied.
+      - If one match is found:
+
+        - Stop traversing the rest of valid rules.
+        - **Update** that record.
+      - If zero or multiple matches are found:
+
+        - Continue with the next rule.
+      - If all rules are exhausted and no single match is found:
+
+        - **Create** a new record.
+  - If there are no match rules for your model:
+
+    - **Create** a new record.
+
+By default 2 rules are installed for production instances:
+
+- One rule that will allow you to update companies based on their VAT, when
+  ``is_company`` is ``True``.
+- One rule that will allow you to update users based on their login.
+
+In demo instances there are more examples.

base_import_match/readme/ROADMAP.rst

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+* Add a setting to throw an error when multiple matches are found, instead of
+  falling back to creation of new record.

base_import_match/readme/USAGE.rst

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+To use this module, you need to:
+
+#. Follow steps in **Configuration** section above.
+#. Go to any list view.
+#. Press *Import* and follow the import procedure as usual.