C#: Add upgrade script.

csharp/ql/lib/upgrades/15b989afd2bfc4743536fdb0958c1d8177a32600/upgrade.properties

@@ -0,0 +1,66 @@
+description: Delete all `cil` and `dotnet` related relations and types.
+compatibility: breaking
+cil_instruction.rel: delete
+cil_jump.rel: delete
+cil_access.rel: delete
+cil_value.rel: delete
+cil_switch.rel: delete
+cil_instruction_location.rel: delete
+cil_type_location.rel: delete
+cil_method_location.rel: delete
+cil_type.rel: delete
+cil_pointer_type.rel: delete
+cil_array_type.rel: delete
+cil_function_pointer_return_type.rel: delete
+cil_method.rel: delete
+cil_method_source_declaration.rel: delete
+cil_method_implementation.rel: delete
+cil_implements.rel: delete
+cil_field.rel: delete
+cil_parameter.rel: delete
+cil_parameter_in.rel: delete
+cil_parameter_out.rel: delete
+cil_setter.rel: delete
+cil_custom_modifiers.rel: delete
+cil_type_annotation.rel: delete
+cil_getter.rel: delete
+cil_adder.rel: delete
+cil_remover.rel: delete
+cil_raiser.rel: delete
+cil_property.rel: delete
+cil_event.rel: delete
+cil_local_variable.rel: delete
+cil_function_pointer_calling_conventions.rel: delete
+cil_handler.rel: delete
+cil_handler_filter.rel: delete
+cil_handler_type.rel: delete
+cil_method_stack_size.rel: delete
+cil_public.rel: delete
+cil_private.rel: delete
+cil_protected.rel: delete
+cil_internal.rel: delete
+cil_static.rel: delete
+cil_sealed.rel: delete
+cil_virtual.rel: delete
+cil_abstract.rel: delete
+cil_class.rel: delete
+cil_interface.rel: delete
+cil_security.rel: delete
+cil_requiresecobject.rel: delete
+cil_specialname.rel: delete
+cil_newslot.rel: delete
+cil_base_class.rel: delete
+cil_base_interface.rel: delete
+cil_enum_underlying_type.rel: delete
+cil_type_parameter.rel: delete
+cil_type_argument.rel: delete
+cil_typeparam_covariant.rel: delete
+cil_typeparam_contravariant.rel: delete
+cil_typeparam_class.rel: delete
+cil_typeparam_struct.rel: delete
+cil_typeparam_new.rel: delete
+cil_typeparam_constraint.rel: delete
+cil_attribute.rel: delete
+cil_attribute_named_argument.rel: delete
+cil_attribute_positional_argument.rel: delete
+metadata_handle.rel: delete