Add missing glyphs

[mskelton]

The following glyphs are missing.

Operator Mono Light

• [ ] percent.alt

Operator Mono Light

• [ ] percent.alt

Operator Mono SSm Light

• [x] equal_equal_greater.liga
• [x] equal_equal.liga
• [x] equal_greater.liga
• [x] equal_less_less.liga
• [x] exclam_equal.liga
• [x] greater_equal_greater.liga
• [x] greater_greater_equal.liga
• [x] hyphen_greater.liga
• [x] hyphen_hyphen_greater.liga
• [x] less_equal_equal.liga
• [x] less_equal_greater.liga
• [x] less_equal_less.liga
• [x] less_hyphen_hyphen.liga
• [x] less_hyphen.liga
• [ ] percent.alt

Operator Mono SSm Light Italic

• [x] equal_less_less.liga
• [x] greater_greater_equal.liga
• [ ] percent.alt

[mskelton]

Checked items fixed by #103

[kiliman]

The Light versions don't have percent.alt since the original percent already had open circles. Apparently the light was too light to have the filled circles.