Couple of fixes and a new feature for bank/GB (#25)

* Exclude crafting spells using Fel Blood

Updated cost calculation to exclude spells using Fel Blood in crafting.

* Epoch lua error fix

* Slow mail loot when low FPS to avoid double looting

* Allowing withdrawing items from bank/GB using "AH shortfall" to withdraw based on post cap and now ALSO minPrice of those items has to be above current DBMinBuyout.

* Fixing an infinite loop bug with invalid custom price of Default Craft Value Method

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Co-authored-by: Szyler <Szyler@Szyler.com>

TradeSkillMaster/GUI/BuildPage.lua

@@ -303,6 +303,7 @@ local Add = {
 				else
 					TSM:Print(L["Invalid custom price."].." "..err)
 					self:SetFocus()
+					return
 				end
 			else
 				args.callback(self, event, value)