Updated window with XML/CSV/JSON upload options. Added unloading Google Product Type and Category

Updated window with XML/CSV/JSON upload options. Added an upload and an additional Google Merchant Product Type field, as well as a Google Merchant Product Category.

If no Google Merchant Product Category parameters are specified in the Category, then the Google Merchant Product Type or "Category Title" field is used by default in XML upload for Google Merchant.

Google Merchant Product Type - https://support.google.com/merchants/answer/6324406?hl=en

Google Merchant Product Category -https ://support.google.com/merchants/answer/6324436?hl=en

Added function to replace tabs with a drop-down list (Accordion)
Added template demo and quick install.
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