PackedAssetLibrary: use Path.join for rootPath
PackedAssetLibrary: use Path.join for rootPath

player-03/lime,player-03/lime,openfl/lime,openfl/lime,player-03/lime,openfl/lime,openfl/lime,player-03/lime,player-03/lime,openfl/lime,player-03/lime,openfl/lime,openfl/lime,player-03/lime