Added observer list
Added FlxSignalObserver class
Added OnSignalEmit call
Renamed OnSignalEmit to OnSignalEmitted
Added FlxSignalObserverList.Destroy method
Observer listener to public
FlxSignal implementation
First implementation of signals system
Renamed RegisterObserver to RegisterListener
Fixed some bugs in FlxSignal
Added FlxSignals helper class
Signals string map replaced by int map
Added functions slots
Fixed naming for privates methods
Improvements for signals helper
Added method for emit few signals and all signals
Signal ID property added
Naming refactoring
Added Disconnect method for signals
Destroy and Clear for FlxSignals