Generate a numeric alignment value based on a symbolic, case sensitive, alignment string

Parameters: alignment A string value of "left", "right", "center", "top", "bottom"

Returns: A numeric value for alignment corresponding to gre.LEFT, gre.RIGHT, gre.CENTER, gre.TOP or gre.BOTTOM Example:

-- Set an alignment variable to be left aligned
local alignment = gre.to_alignment("left")
gre.set_value("myLayer.myControl.horizontalAlignment", alignment)
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