Fix VeraPDF rule 6.3.5-3: the font descriptor dictionary shall include a CIDSet stream about fpdf2 HOT 1 OPEN

test/encryption/encrypt_fonts.pdf
test/fonts/add_font_unicode.pdf
test/fonts/charmap_first_999_chars-cmss12.pdf
test/fonts/charmap_first_999_chars-DejaVuSans-Oblique.pdf
test/fonts/charmap_first_999_chars-DroidSansFallback.pdf
test/fonts/charmap_first_999_chars-DejaVuSansMono.pdf
test/fonts/charmap_first_999_chars-NotoSansSymbols.pdf
test/fonts/charmap_first_999_chars-DejaVuSans.pdf
test/fonts/charmap_first_999_chars-NotoSerif.pdf
test/fonts/charmap_first_999_chars-NotoSans.pdf
test/fonts/charmap_first_999_chars-Quicksand-Regular.pdf
test/fonts/charmap_first_999_chars-Roboto-Regular.pdf
test/fonts/fallback_font.pdf
test/fonts/fallback_font_ignore_style.pdf
test/fonts/fonts_otf.pdf
test/fonts/charmap_first_999_chars-TwitterEmoji.pdf
test/fonts/fallback_font_with_overriden_get_fallback_font.pdf
test/fonts/charmap_first_999_chars-Waree.pdf
test/fonts/fonts_emoji_glyph.pdf
test/fonts/render_en_dash.pdf
test/fonts/fonts_two_mappings.pdf
test/fonts/fonts_remap_nb.pdf
test/fonts/thai_text.pdf
test/html/html_heading_hebrew.pdf
test/html/html_custom_pre_code_font.pdf
test/html/issue_156.pdf
test/outline/russian_heading.pdf
test/table/table_with_ttf_font.pdf
test/table/table_with_ttf_font_and_headings.pdf
test/text/cell_curfont_leak.pdf
test/text/cell_markdown_right_aligned.pdf
test/text/cell_markdown_with_ttf_fonts.pdf
test/text/multi_cell_char_spacing.pdf
test/text/multi_cell_justified_with_unicode_font.pdf
test/text/multi_cell_font_stretching.pdf
test/text/multi_cell_font_leakage.pdf
test/text/multi_cell_j_paragraphs.pdf
test/text/multi_cell_markdown_with_ttf_fonts.pdf
test/text/text_positioning.pdf
test/text/varfrags_fonts.pdf
test/text/write_font_stretching.pdf