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Refactor padding functions

The `padLeft` and `padRight` functions were nearly identical and could
benefit from being refactored to share common code.

A new function called `pad` was added that applies padding based on the
sign of the amount of padding needed. A positive value applies padding
to the right side while a negative value applies padding to the left
side.

Issue: #252
Signed-off-by: Michael Lorant <michael.lorant@nine.com.au>