core:
 * Annotations: Make sure we embed fonts for the FreeText annots
 * Forms: Make sure we embedd fonts as needed
 * Signatures: Make sure we embed the needed fonts
 * CairoOutputDev: color type 3 fonts
 * fix two bugs in multiline find_text()
 * code improvements

utils:
 * pdftotext: added TSV mode
 * HtmlOutputDev: don't use png.h

cpp:
 * Use time_t for time
 * Add page_transition::durationReal

qt:
 * Pass leftFontSize down to `FormWidgetSignature::signDocumentWithAppearence`