Added the new "Create Purchase Quote" feature in order allow the creation of purchase quotes for multiple vendors

When the new feature is activated, then a new way of creating the purchase quotes from a sales quote is possible.

When the sales quote card is open, and the user choses the action "Generate Purchase Quote", then a new page will be opened to the user. 

By default when opened, the page is filled with the "Vendor No." from the sales lines. However, if it choses, the user can add other vendors in the list. All the vendors from the list are considered when the program will create the purchase quotes. Also, if required, the user can select the "Purchase Quote Code" and only the respective line(s) from the sales quote document will be considered for the operation.

Once the user clicks on "OK", the automated proces is started and the purchase quotes are created. Once the process is concluded, a corresponding message will appear to notify the user.