Add some Unicode dingbats to Figtree

[agusbou2018]

Please add the following Unicode dingbats to Figtree:

• ■ (Black Square, U+25A0)
• ▲ (Black Up-Pointing Triangle, U+25B2)
• ▶ (Black Right-Pointing Triangle, U+25B6)
• ▼ (Black Down-Pointing Triangle, U+25BC)
• ● (Black Circle, U+25CF)
• ◀ (Black Left-Pointing Triangle, U+25C0)
• ★ (Black Star, U+2605)
• ☐ (Ballot Box, U+2610)
• ☑ (Ballot Box with Check, U+2611)
• ♦ (Black Diamond Suit, U+2666)
• ✓ (Check Mark, U+2713)

These special characters are included in the commercial font Proxima Nova (by Mark Simonson), but for now I can't afford to buy it and I like to be added to Figtree.