• Rebuilt most glyphs with the new powerful outline builder -- spiros, based on my libspiro port libspiro-js.
• We have a "Iosevka CC" variant with the width of geometric symbols and box drawing glyphs set to 1em. This is extremely useful for preserving compatibility with East Asian terminal applications, including TELNET BBSes.
• Made "crowded" glyphs, like /m, in bold weight darker.
• Added tone symbols (˥ ˦ ˧ ˨ ˩).