Issue #3323272: DomPDF settings

config/install/pdf_api.dom_pdf.settings.yml

+defaultFont: 'serif'
+dpi: 96
+fontHeightRatio: 1.1
+pdfBackend: 'CPDF'
+pdflibLicense: ''
+isPhpEnabled: false
+isRemoteEnabled: true
+isJavascriptEnabled: true
+chroot: ['.']
+fontDir: 'temporary://'
+fontCache: 'temporary://'
+tempDir: 'temporary://'
+debugPng: false
+debugKeepTemp: false
+debugCss: false
+debugLayout: false
+debugLayoutLines: true
+debugLayoutBlocks: true
+debugLayoutInline: true
+debugLayoutPaddingBox: true