[implemented] Don't make PreviewCraftItem private! D:

[manavortex]

So, I just was on PTS, and...

user:/AddOns/CraftingPreview/CraftingPreview.lua:43: Attempt to access a private function 'PreviewCraftItem' from insecure code. The callstack became untrusted 9 stack frame(s) from the top.
stack traceback:
	user:/AddOns/CraftingPreview/CraftingPreview.lua:43: in function 'ZO_ItemPreviewType_Crafting:Apply'
	EsoUI/IngameShared/ItemPreview/ItemPreview_Shared.lua:358: in function 'ZO_ItemPreview_Shared:Apply'
	EsoUI/IngameShared/ItemPreview/Keyboard/ItemPreview_Keyboard.lua:97: in function 'ZO_ItemPreview_Keyboard:Apply'
	EsoUI/IngameShared/ItemPreview/ItemPreview_Shared.lua:352: in function 'ZO_ItemPreview_Shared:ApplyOrBuffer'
	EsoUI/IngameShared/ItemPreview/ItemPreview_Shared.lua:301: in function 'ZO_ItemPreview_Shared:SharedPreviewSetup'
	user:/AddOns/CraftingPreview/CraftingPreview.lua:47: in function 'ZO_ItemPreview_Shared:PreviewCraftItem'
	user:/AddOns/CraftingPreview/CraftingPreview.lua:109: in function 'ZO_Smithing:EnablePreview'
	user:/AddOns/CraftingPreview/CraftingPreview.lua:167: in function 'hookFunction'
	EsoUI/Libraries/Utility/ZO_Hook.lua:19: in function '(anonymous)'
	(tail call): ?
	user:/AddOns/MultiCraft/MultiCraft.lua:514: in function 'SetMode'
	EsoUI/Ingame/Crafting/Keyboard/Smithing_Keyboard.lua:208: in function 'callback'
	EsoUI/Libraries/ZO_MenuBar/ZO_MenuBar.lua:280: in function 'MenuBarButton:Release'
	EsoUI/Libraries/ZO_MenuBar/ZO_MenuBar.lua:628: in function 'ZO_MenuBarButtonTemplate_OnMouseUp'
	ZO_MainMenuCategoryBarButton1_MouseUp:3: in function '(main chunk)'