Aetherium - Vulkan Shader

Fixed

• Mining a block showed no crack with Photon. The crack is now drawn after the pack's deferred passes, wherever it lies, and it is no longer drawn into the shadow map.
• Enchanted items and armour showed a garbled, rainbow-striped glint with packs that store packed data in their first output (Photon). Packs with their own glint program now draw the glint with it, over the item.

Also fixed

• NeoForge: the game crashed at startup ("Texture does not exist") when a texture atlas ticked before it was first uploaded, which NeoForge does while resources are still loading.
• The shader pack screen's "Open packs folder" did nothing when the shaderpacks folder did not exist yet; it now creates the folder and opens it.