Added Logic to prevent excessive triggering if condition is met

[clackner-gpa]

This adds a Connectionstring parameter to prevent an email from going out on every recalculation as long as the condition is met. If MultiTriggerPrevention is true an email will only go out the first time the condition evaluates to true subsequent evaluation will be ignored until the condition evaluates to false at least once.

This prevents the system from sending out continous emails when using complex alarm logic

[clackner-gpa]

The DynamicCalculator base class is not neccesarrily evaluating a bool so that won't work. Cleanest solution would bve an intermediate base class DynamicTrigger that uses Dynamic Calculator to trigger something and stick it in there. But that's too much work for now.