Add raw receipt printing#272
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Added a new raw ESC/POS printing method using QZ Tray silent printing.
When the selected print format type is set to Raw, invoices are printed using direct ESC/POS commands instead of HTML-to-image rendering, improving compatibility and reliability on thermal printers.
Most of the thermal printers have issue when printing converted html image ... for thermal printers its better and fast if we do raw command printing ...
Also supports drawer opening and paper cutting through the commands..
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