Spiffworkflow 1.2: Top Level Imports moved to appropriate modules
- replace 'from SpiffWorkflow import WorkflowException' to 'from SpiffWorkflow.exceptions import WorkflowException'
- replace 'from SpiffWorkflow import TaskState' to 'from SpiffWorkflow.task import TaskState'
- replace 'from SpiffWorkflow import Task' to 'from SpiffWorkflow.task import Task'
SpiffWorkflow 1.2: Navigation code removed completely. Proved to be of little use to folks, was super complex and difficult to maintain.
SpiffWorkflow 1.2: When inserting custom functions into the PythonExecutionEngine - be aware that the task data will act as the full context for execution, and will contain global functions and methods during the exec call.
SpiffWorkflow 1.2: All Task Specs now have a spec_type attribute, containing a descriptive string of the type, such as "User Task", "Script Task", "Start Event" etc...
Spiffworkflow 1.2: remove all references of timeit (no longer in SpiffWorkflow)
Spiffworkflow 1.2: pythonScriptEngine._evaluate no longer accepts a task argument.
Spiffworkflow 1.2: CancelEventDefinition was removed - please use SignalEventDefinition instead
EX: replace bpmn_workflow.signal('cancel') # generate a cancel signal.
bpmn_workflow.catch(CancelEventDefinition())
WITH: bpmn_workflow.catch(SignalEventDefinition('cancel'))
Spiffworkflow 1.2: Task States are JUST integers and TaskSpecNames is now a public dictionary, and can be used to covert a state to human readable string
EX: REPLACE: user_task.state.name
WITH: TaskStateNames[user_task.state]
Upraded SpiffWorkflow and now use th new get_subprocess_specs
updated the calculate_stats in the workflow processor - as the serialization had changed drastically, and needed to debug some performance issues.
Added a get_navigation method that will calcuate a basic navigation list MUCH faster than using the get_flat_nav_list in Spiffworkflows Navigation object.
Modified a hellton of tests because we don't have total_task and completed_task counts, or a complex nested navigation list anymore.
* removed all the performance metric code into a separate function.
* restructured the code so it is either creating a new workflow, or deserializing an old one.
* Added code to upgrade serialized objects from 1.0 to 1.1
* Using the new method of creating a bpmn_workflow object:
```python
parser = self.get_spec_parser(self.spec_files, spec_info)
top_level = parser.get_spec(spec_info.primary_process_id)
subprocesses = parser.get_process_specs()
self.bpmn_workflow = BpmnWorkflow(top_level, subprocesses, script_engine=self._script_engine)
```
Fixed a few minor bugs that stood out while testing
1. when updating a workflow, we should check for a valid task BEFORE calling cancel_notify, which requires a valid task.
2. get_localtime - quick fix on the date parser - for python 3.9.
3. the start_workflow script would error out in a way that made it unclear which workflow was having the problem. Fixed the error.
