Switch from FPDF to tc-lib-pdf

[ScreamingDev]

When creating labels via bulk action the API returns each one in its own PDF
which are merged into one using FPDF.
This old FPDF were replaced by TCPDF which itself again is no longer maintained for 2 years now (why we don't use it),
so we are stuck with some old package when we take GNU GPL in advantage.
This can be solved by the upcoming tc-lib-pdf which is the ancestor of TCPDF
and should be used as soon as it is released.

See https://github.com/tecnickcom/tc-lib-pdf
Currently has the license GNU GPL which also fits perfectly.

[mahype]

@sourcerer-mike Where is this FPDF From? From Woo or WordPress?

[andrecedik]

Yeah, we've received the following message from a customer:

While testing to upgrade my site to PHP7 I got the following error for the Shipcloud Woocommerce integration.

FILE: /wp-content/plugins/shipcloud-for-woocommerce/vendor/setasign/fpdf/fpdf.php 
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FOUND 1 ERROR AFFECTING 1 LINE 
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1044 | ERROR | Function set_magic_quotes_runtime() is deprecated since PHP 5.3 and removed since PHP 7.0 
---------------------------------------------------------------------------------------------------------------------------

FILE: /wp-content/plugins/shipcloud-for-woocommerce/vendor/setasign/fpdf/makefont/makefont.php 
---------------------------------------------------------------------------------------------------------------------------------------- 
FOUND 1 ERROR AFFECTING 1 LINE 
---------------------------------------------------------------------------------------------------------------------------------------- 
388 | ERROR | Function set_magic_quotes_runtime() is deprecated since PHP 5.3 and removed since PHP 7.0 
----------------------------------------------------------------------------------------------------------------------------------------

FILE: /wp-content/plugins/shipcloud-for-woocommerce/vendor/setasign/fpdi/filters/FilterLZW.php 
---------------------------------------------------------------------------------------------------------------------------------------- 
FOUND 1 ERROR AFFECTING 1 LINE 
---------------------------------------------------------------------------------------------------------------------------------------- 
147 | ERROR | Bitwise shifts by negative number will throw an ArithmeticError in PHP 7.0 
-----------------------------------------------------------------------------------------------------------------------------------

So I think it's fair to say that we need a new solution for creating PDFs