fix for "issue" #149
first fix for issue #77 (simplifying sound caching on Android)
Fix neko crashing

This workaround fixes neko crashing, a better solution would be to find out why value becomes null in the first place, but this workaround works.
Merge pull request #401 from SergioB/patch-1

Fix neko crashing
added tileScaleHack var for tilemaps and tileblocks.

It should help adjust tile scale for avoiding "tilemap tearing" (empty
pixels between tiles)
FlxWindow dragging fix.

Now it will drag only one window at a time
FlxWindow parent visibilty check