Allow to define custom rendering options for wkhtmltopdf

[Roshyo]

Fixes #184

[codecov]

Codecov Report

Merging #185 (118fd47) into 0.12.x (170e50c) will increase coverage by 3.89%.
The diff coverage is 84.88%.

❗ Current head 118fd47 differs from pull request most recent head 8776ccb. Consider uploading reports for the commit 8776ccb to get more accurate results

@@             Coverage Diff              @@
##             0.12.x     #185      +/-   ##
============================================
+ Coverage     41.85%   45.75%   +3.89%     
- Complexity      483      501      +18     
============================================
  Files            92       94       +2     
  Lines          1560     1567       +7     
============================================
+ Hits            653      717      +64     
+ Misses          907      850      -57     

Impacted Files	Coverage Δ
src/Form/Type/GiftCardConfigurationType.php	0.00% <0.00%> (ø)
src/Generator/GiftCardCodeGenerator.php	0.00% <0.00%> (ø)
src/DependencyInjection/Configuration.php	100.00% <100.00%> (ø)
...endencyInjection/SetonoSyliusGiftCardExtension.php	83.33% <100.00%> (+13.33%)	⬆️
src/Factory/GiftCardConfigurationFactory.php	100.00% <100.00%> (+100.00%)	⬆️
src/Generator/GiftCardPdfGenerator.php	100.00% <100.00%> (ø)
src/Model/GiftCardConfiguration.php	83.09% <100.00%> (+1.84%)	⬆️
src/Provider/PdfRenderingOptionsProvider.php	100.00% <100.00%> (ø)
...ator/Constraints/Pdf/ValidOrientationValidator.php	100.00% <100.00%> (ø)
...lidator/Constraints/Pdf/ValidPageSizeValidator.php	100.00% <100.00%> (ø)
... and 27 more

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[loevgaard]

Very nice PR, Stephane 🎉