Implement conversions for process-definition level events

[eschabell]

There are a slew of events that can be placed outside the start-state in the process-definition, need to look into these:

EVENTS:
xs:enumeration value="node-enter"
xs:enumeration value="node-leave"
xs:enumeration value="process-start"
xs:enumeration value="process-end"
xs:enumeration value="task-create"
xs:enumeration value="task-assign"
xs:enumeration value="task-start"
xs:enumeration value="task-end"
xs:enumeration value="before-signal"
xs:enumeration value="after-signal"
xs:enumeration value="superstate-enter"
xs:enumeration value="superstate-leave"
xs:enumeration value="timer-create"
xs:enumeration value="subprocess-created"
xs:enumeration value="subprocess-end"

[eschabell]

See proc definition for test glassDamageFinanceProcess for example of event with scripting in it.