core:
 * Forms: Fix crash in forms with their own DR
 * Refactor CairoFontEngine caching
 * CairoOutputDev: preserve text color when drawing type 3 glyphs
 * Windows: font code simplification
 * Minor code improvements

utils:
 * pdfattach: Assume filename is utf8 encoded
 * pdftohtml: Fix type 3 font size calculation

cpp:
 * Add missing header