Add IsAllNull function for error handling
When initializing an effect, the function did not handle a
	struct with inadequate information. An IsAllNull
	function is now part of the EffectInfo struct and
	returns TRUE if all EffectInfo flags is set to false.

	-To use: EffectInfo.IsAllNull()
Merge branch 'Development' of https://github.com/SvinSimpe/Project-Flight-School into Development