API: changed date-format, camelCase instead of snake_case, null values, update and create for customer and project (#718)

config/serializer/App/API.Model.Version.yml

@@ -0,0 +1,25 @@
+App\API\Model\Version:
+    exclusion_policy: All
+    custom_accessor_order: [version, candidate, semver, name, copyright]
+    properties:
+        version:
+            include: true
+            type: string
+            example: 0.9
+            groups: [Default]
+        candidate:
+            include: true
+            type: string
+            groups: [Default]
+        semver:
+            include: true
+            type: string
+            groups: [Default]
+        name:
+            include: true
+            type: string
+            groups: [Default]
+        copyright:
+            include: true
+            type: string
+            groups: [Default]