Version 0.11.0

• Added Pdf::set_binary_marker (thanks to @LaurenzV)
• Added Chunk::refs (thanks to @LaurenzV)
• Added Catalog::associated_files (thanks to @NiklasEi)
• Added FontDescriptor::{style, descriptor_override, cid_set}
• Added FontDescriptorOverride type and methods
• Added CjkClass and WMode enums
• Added Cmap::{writing_mode, use_cmap_stream, use_cmap_predefined}
• Added UnicodeCmap::with_writing_mode
• Added lots of documentation about PDF/A compliance
• Fixed return type of Catalog::output_intents (Breaking change)