Made "opencase_cases" and "opencase_no_cases" modules and gave the latter a version of the contextual menu

modules/opencase_cases/opencase_cases.info.yml

@@ -0,0 +1,7 @@
+name: 'Opencase Cases'
+type: module
+description: 'Provides case entities and a required field on activities linking them to a case.'
+core: 8.x
+package: 'OpenCase'
+dependencies:
+  - opencase_entities