SalesforceRestDataProvider serializes DATE fields as DATETIME

[davidnich]

this causes errors:

2020.05.02 08:23:41.353973 T14: ID 105: WI 79983: ErpOrdersToCrmStep(672/0): User exception: /Users/david/src/Qorus/test/qlib/SalesforceRestDataProvider/SalesforceRestObjectDataProvider.qc:195 (Qore): HTTP-CLIENT-RECEIVE-ERROR: HTTP status code 400 received: message: Bad Request (arg: {request-uri: "POST /services/data/v48.0/sobjects/Order HTTP/1.1", response-code: 400, response-body: [{message: "Cannot deserialize instance of date from VALUE_STRING value 2020-04-30T13:19:18.000000+02:00 or request may be missing a required field at [line:1, column:35]", errorCode: "JSON_PARSER_ERROR"}]})
  SalesforceRestObjectDataProvider::createRecordImpl() called at /Users/david/src/Qorus/test/qlib/DataProvider/AbstractDataProvider.qc:244 (Qore user code)
  AbstractDataProvider::createRecord() called at /Users/david/src/Qorus/test/qlib/Mapper.qm:2068 (Qore user code)
  Mapper::mapDataIntern() called at /Users/david/src/Qorus/test/qlib/Mapper.qm:1873 (Qore user code)
  Mapper::mapData() called at /Users/david/src/Qorus/test/qlib/Mapper.qm:1842 (Qore user code)
  Mapper::mapAll() called at CLASS BBM_GenericMapper:1.0:27 (Qore source "BBM_GenericMapper-1.0.qclass":27 user code)
  BBM_GenericMapper::genericMapper() called at <builtin>:-1 (Qore user code)
  call_object_method_args() called at ErpOrdersToCrmStep:39 (Qore source "/Users/david/src/Qorus/test/user/src/ErpOrdersToCrmStep-1.0.qstep":39 builtin code)
  ClassConnections_ErpOrdersToCrmStep::callClassWithPrefixMethod() called at ErpOrdersToCrmStep:46 (Qore source "/Users/david/src/Qorus/test/user/src/ErpOrdersToCrmStep-1.0.qstep":46 user code)
  ClassConnections_ErpOrdersToCrmStep::Connection_1() called at ErpOrdersToCrmStep:15 (Qore source "/Users/david/src/Qorus/test/user/src/ErpOrdersToCrmStep-1.0.qstep":15 user code)
  ErpOrdersToCrmStep::primary() called at <builtin>:-1 (Qore user code)
  call_object_method_args() called at Workflow.qc:218 (Qore builtin code)
  Workflow::runStepPrimaryArgs() called at WorkflowExecutionInstance.qc:2712 (Qore user code)
  WorkflowExecutionInstance::executeNormalStep() called at WorkflowExecutionInstance.qc:1533 (Qore user code)
  WorkflowExecutionInstance::execStep() called at WorkflowExecutionInstance.qc:1638 (Qore user code)
  WorkflowExecutionInstance::execStepThread() called at WorkflowExecutionInstance.qc:1992 (Qore user code)
  WorkflowExecutionInstance::execSegment() called at WorkflowExecutionInstance.qc:947 (Qore user code)
  WorkflowExecutionInstance::startRecoverySegment() called at WorkflowExecutionInstance.qc:1057 (Qore user code)
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