Tabular numbers and slashed zero alternative

Changes:

  • Add support for tabular numbers(numbers taking equal horizontal space) to use in spreadsheets and contexts where you need to compare numbers.
  • Add slashed zero alternative
  • Add tests for tabular numbers.
  • Update build dependencies
  • Add glyphs for ണ്ട്രു, ണ്ട്രൂ, ക്ട, പ്ട