Applying reorganizing packs doesn't work with game-shell

[deathcap]

Test with game-shell-voxel, start with default pack, press P, drag in another (tested with MC175.zip). The changes apply after the pack loads (but see voxel/voxel-stitch#2), as expected. But if you drag the first pack to the top, then click Preview, it does not take precedence. stitch() is called, and game.plugins.get('voxel-stitch').emit('addedAll') can be manually executed from the debugger to force createTileMap(), to no effect. The old pack textures always remain in effect.