Grocycode, label printing (#1500)

* Grocycode: Productpicker, StockService

* Grocycode: Datamatrix generation

* Grocycode: Display in UI, make Images downloadable

* Grocycode: Do not show on product card

* Grocycode: Stockentry Label view

* Grocycode: Webhooks & Labelprinter Feature

* Grocycode: Manual Label printing

* Grocycode: Print Label from product form

* Quagga2: use zxing for DataMatrix recognition

* Grocycode: Default settings for label printing

* Prepare merge of master

* Grocycode: docs

* Docs: label printing webhook

* Review

- "grocy" is currently written lower-case everywhere, so let's do this also for "grocycode"
- Unified phrases / capitalization
- Minor UI adjustments (mainly context menu item ordering / ordering/spacing on product edit page)
- Documented API changes for Swagger UI (grocy.openapi.json)
- Reverted German localizations (those are managed via Transifex; would cause conflicts when manually edited - will import them later there)
- Reverted a somehow messed up localization string (productform/help text for `cumulate_min_stock_amount_of_sub_products`)
- Suppress deprecation warnings when generating Datamatrix PNG (otherwise the PNG is invalid, https://github.com/jucksearm/php-barcode/issues/3)
- Default `FEATURE_FLAG_LABELPRINTER` to disabled

Co-authored-by: Bernd Bestel <bernd@berrnd.de>

config-dist.php

@@ -159,6 +159,21 @@ DefaultUserSetting('quagga2_patchsize', 'medium');
 DefaultUserSetting('quagga2_frequency', 10);
 DefaultUserSetting('quagga2_debug', true);
 
+// Label Printer Settings
+// This is the URI that grocy will POST to when asked to print a label.
+Setting('LABEL_PRINTER_WEBHOOK', '');
+// This setting decides whether the webhook will be called server- or clientside.
+// If the machine grocy runs on has a network connection to the host
+// the webhook receiver is on, this is probably a good idea.
+// If, for example, grocy runs in the cloud and your printer daemon
+// runs locally to you, set this to false to let your browser call
+// the webhook instead.
+Setting('LABEL_PRINTER_RUN_SERVER', true);
+// Additional Parameters supplied to the webhook.
+Setting('LABEL_PRINTER_PARAMS', ['font_family' => 'Source Sans Pro (Regular)']);
+// Use JSON or normal POST request variables?
+Setting('LABEL_PRINTER_HOOK_JSON', false);
+
 // Feature flags
 // grocy was initially about "stock management for your household", many other things
 // came and still come by, because they are useful - here you can disable the parts
@@ -172,6 +187,7 @@ Setting('FEATURE_FLAG_TASKS', true);
 Setting('FEATURE_FLAG_BATTERIES', true);
 Setting('FEATURE_FLAG_EQUIPMENT', true);
 Setting('FEATURE_FLAG_CALENDAR', true);
+Setting('FEATURE_FLAG_LABELPRINTER', false);
 
 // Sub feature flags
 Setting('FEATURE_FLAG_STOCK_PRICE_TRACKING', true);