Merge tag '0.15.0' into develop

* Add new JSON options to register a special encoder/decoder for JsonResource
* Add possibility to "reaffect" EStructuralFeatures that are collections
* Fix issue with JSON resources not using to_string(...) for EDataType instances
* Fix issue with multiple re-loading and writing of a resource in the same target file
* Deprecate Python 3.7
* Fix/update english of the README.rst

En memoria de Rosa Nallely Murillo Vazquez (03/12/2023) quien fue una
investigadora muy creativa, una increíble química, y tuve suerte de ser
su esposo.

CHANGELOG.rst

@@ -615,12 +615,12 @@ The fix solves the loading issue by skiping empty references.
   cases, an option is now available: ``XMIOptions.OPTION_USE_XMI_TYPE``.
 
 **Bugfixes**
--  Add missing 'type' field for XMI href serialization. The 'xsi:type' field is
-   required when a crossreference is serialized. This field is used to check if
-   the resolved resource has the right type (not really, but it help). This
-   field is kinda optional at the moment for PyEcore, but required for Java-EMF,
-   otherwise the EMF will not be able to create the right proxy for the
-   crossreferenced resource.
+- Add missing 'type' field for XMI href serialization. The 'xsi:type' field is
+required when a crossreference is serialized. This field is used to check if
+the resolved resource has the right type (not really, but it help). This
+field is kinda optional at the moment for PyEcore, but required for Java-EMF,
+otherwise the EMF will not be able to create the right proxy for the
+crossreferenced resource.
 
 
 0.7.8/0.7.11

README.rst

@@ -219,7 +219,7 @@ either.
 PyEMOFUC proposes, like PyEMOF, a pure Python implementation of the OMG's EMOF.
 If we stick to a kind of EMF terminology, PyEMOFUC only supports dynamic
 metamodels and seems to provide a reflexive layer. The project does not appear
- to have moved since a while.
+to have moved since a while.
 
 Contributors
 ============