fix missing type on var scripts = null, and clean up some related unused variables

Author: joshtynjala

src/swf/exporters/AnimateLibraryExporter.hx

@@ -815,9 +815,6 @@ class AnimateLibraryExporter
 			symbol.scale9Grid = serializeRect(scalingGrid.splitter.rect);
 		}
 
-		var scripts = null;
-		var found = false;
-
 		var swfSymbol = symbolsByTagID.get(symbol.id);
 		if (swfSymbol != null)
 		{

src/swf/exporters/FrameScriptParser.hx

@@ -60,7 +60,7 @@ class FrameScriptParser
 		{
 			cls = swfData.abcData.findClassByName(className);
 		}
-		var scripts = null;
+		var scripts:Array<String> = null;
 
 		if (cls != null && cls.fields != null && cls.fields.length > 0)
 		{

src/swf/exporters/SWFLiteExporter.hx

@@ -653,7 +653,6 @@ class SWFLiteExporter
 			symbol.scale9Grid = scalingGrid.splitter.rect;
 		}
 
-		var scripts = null;
 		var swfSymbol = symbolsByTagID.get(symbol.id);
 		if (swfSymbol != null)
 		{