Update for HaxeFlixel/flixel#1100

Author: Gama11

flixel/addons/effects/FlxTrail.hx

@@ -2,7 +2,7 @@ package flixel.addons.effects;
 
 import flixel.FlxG;
 import flixel.FlxSprite;
-import flixel.group.FlxTypedGroup;
+import flixel.group.FlxGroup;
 import flixel.system.FlxAssets;
 import flixel.util.FlxDestroyUtil;
 import flixel.math.FlxPoint;

flixel/addons/effects/FlxTrailArea.hx

@@ -8,7 +8,7 @@ import flash.geom.Point;
 import flash.geom.Rectangle;
 import flixel.FlxG;
 import flixel.FlxSprite;
-import flixel.group.FlxTypedGroup;
+import flixel.group.FlxGroup;
 import flixel.math.FlxAngle;
 import flixel.util.FlxColor;
 import flixel.util.FlxDestroyUtil;

flixel/addons/weapon/FlxWeapon.hx

@@ -4,7 +4,7 @@ import flixel.FlxBasic;
 import flixel.FlxG;
 import flixel.FlxObject;
 import flixel.FlxSprite;
-import flixel.group.FlxTypedGroup;
+import flixel.group.FlxGroup;
 import flixel.system.FlxAssets.FlxGraphicAsset;
 import flixel.system.FlxSound;
 import flixel.input.touch.FlxTouch;