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fix: validate hex colours in hexColor() to prevent XML injection #318

Job	Run time
docs-pr	9s
Build Docker Image	8m 44s
PDF Visual Regression	7m 15s
Lint & Test	7m 25s
Build & Test (linux-kvm-debug)	6m 11s
Build & Test (linux-kvm-release)	6m 11s
Build & Test (linux-mshv-debug)	6m 33s
Build & Test (windows-whp-debug)	7m 6s
Build & Test (linux-mshv-release)	6m 43s
Build & Test (windows-whp-release)	8m 30s
CI Status	3s
	1h 4m 50s