Micro 6x7px font for mcu/embedded project

Original idea by FireFly

Memory size

• digits + symbols - 13 * 3 bytes each half glyph + 19 * 1 byte indexes = 58 bytes
• all (digits + symbols + alphabet) - 24 * 3 bytes each half glyph + 47 * 2 bytes indexes = 166 bytes

indexes arrays may be unneeded if you use fixed print