DCworms

Periodic execution of plugins

Added <frequency> element in every plugin (except of TimeEstimationPlugin and MetricsCalculatorPlugin) which defines every what period of time the plugin will be executed.

Added BasePlugin class.
Changed single TIMER event to separate events like TIMER_AIRFLOW etc.
Removed PluginConfiguration classes.
Removed unused powerFloorLevel from EnergyEstimationPlugin.
Fixed unnecessary boxing and unboxing of powerCapLevel.
Fixed missing access to parameters inside plugins.
Fixed issue with CALENDAR_EVENTS_FINISHED event not being called.