chore: upgrade to OpenSeaDragon 3
Test the upgrade with e.g. this manifest: https://ahiqar.uni-goettingen.de/api/textapi/ahikar/syriac/3r678/manifest.json
closes #361 (closed)
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Test the upgrade with e.g. this manifest: https://ahiqar.uni-goettingen.de/api/textapi/ahikar/syriac/3r678/manifest.json
closes #361 (closed)