[#1][V2.0 - Alpha5] Add actions for the orders module 
in admin panel

-- Add changing payment method functionality
[#1]Add actions for the orders module in admin panel

-- Add the changing shipping method functionality
Clear the 'icon not found error' for the shipping modules as 
editing the shipping method in the orders module
[#1][V2.0 - Alpha5] Add actions for the orders module 
in admin panel

-- Add the feature: update product quantity as editing order
[#1][V2.0 - Alpha5] Add actions for the orders module 
in admin panel

-- Add the feature: update price of the order product as 
editing the order
[#1]Add actions for the orders module in admin panel

-- support the feature: Add product for the order
Remove the get_product_id function in the language_helper 
because all the helpers for product are located 
in products_helper
Clear the notice error for the id property in the product 
library
Reame the get_total method to get_order_total method in the 
order library to prevent the confliction with sub-order 
library
[#1][V2.0 - Alpha5] Add actions for the orders module 
in admin panel

-- Add the print order feature for the orders module