Commonly used error classes in Fever.

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	Class	Description
	AbstractConstructorAccessException	Throws an AbstractConstructorAccessException when try to instanciate an abstract class without protected constructor access.
	CoreEngineException	Throws an CoreEngineException when Fever core initialization failed.
	IllegalShortcutArgumentsException	Throws an IllegalShortcutArgumentsException when a KeyShortcut instanciation is not success.
	NoSuchOverloadingException	Throws an NoSuchOverloadingException when a Overloader not find a correct overloading definition.
	PluginRuntimeException	Throws an PluginRuntimeException when runtime plugin registration failed
	UnimplementedOverridingException	Throws an UnimplementedOverridingException when a abstract method is not overrided in a subclass implementation.