improve receipt/details reports and implement number formatting

1) eager load reports for receipt/details
2) introduce number_format lookups to replace print_settings for number formatting
3) implement NumberFormattable concern, reference number_format lookups or print_settings if not exist, to get number format settings and number formatting
4) replace rails NumberHelper.number_with_precision with NumberFormattable.number_format hopefully to reduce overhead, formatting numbers for huge lists of data

app/models/sale_item.rb

@@ -1,4 +1,5 @@
 class SaleItem < ApplicationRecord
+  include NumberFormattable
   self.primary_key = "sale_item_id"
 
   #primary key - need to be unique generated for multiple shops
@@ -294,8 +295,6 @@ class SaleItem < ApplicationRecord
     if self.unit_price != self.unit_price_was || self.price != self.price_was
       if unit_price_fraction > 0 || price_fraction > 0
         if ['Discount', 'promotion'].include?(self.status)
-          precision = PrintSetting.get_precision_delimiter().precision.to_i
-
           self.unit_price = self.unit_price.round(precision)
           self.price = (self.unit_price * self.qty).round(precision)
           self.taxable_price = self.price