Allow live pdf template edit

[Roshyo]

Related to #187

[codecov]

Codecov Report

Merging #191 (3dab5e6) into 0.12.x (a70f927) will increase coverage by 2.74%.
The diff coverage is 78.64%.

❗ Current head 3dab5e6 differs from pull request most recent head 8acee4b. Consider uploading reports for the commit 8acee4b to get more accurate results

@@             Coverage Diff              @@
##             0.12.x     #191      +/-   ##
============================================
+ Coverage     45.75%   48.50%   +2.74%     
- Complexity      501      525      +24     
============================================
  Files            94      101       +7     
  Lines          1567     1670     +103     
============================================
+ Hits            717      810      +93     
- Misses          850      860      +10     

Impacted Files	Coverage Δ
src/Form/Type/GiftCardConfigurationType.php	0.00% <0.00%> (ø)
src/Generator/GiftCardCodeGenerator.php	100.00% <ø> (+100.00%)	⬆️
src/Twig/Extension/PdfExtension.php	0.00% <0.00%> (ø)
src/Twig/Extension/PdfRuntime.php	37.50% <37.50%> (ø)
...r/Action/Admin/GenerateEncodedExamplePdfAction.php	100.00% <100.00%> (ø)
...ontroller/Action/Admin/LoadDefaultPdfCssAction.php	100.00% <100.00%> (ø)
...endencyInjection/SetonoSyliusGiftCardExtension.php	84.21% <100.00%> (+0.87%)	⬆️
src/Factory/GiftCardFactory.php	100.00% <100.00%> (ø)
src/Generator/GiftCardPdfGenerator.php	100.00% <100.00%> (ø)
src/Generator/GiftCardPdfPathGenerator.php	100.00% <100.00%> (ø)
... and 4 more

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