private String applyEquateOverRange(ProgramSelection selection) {
		InstructionIterator it = program.getListing().getInstructions(context.getSelection(), true);
		String errorMessage = null;
		for (Instruction instruction : it) {
			for (int i = 0; i < instruction.getNumOperands(); i++) {
				String m = applyEquate(instruction, i, 0);
				if (errorMessage == null && m != null) {
					errorMessage = m;
				}
			}
		}
		return errorMessage;
	}
Constructor for the command to convert scalars and data to the user chosen format. The
command will work at a single address or over a selection in the case where the current
location refers to an instruction.  
<br>
Data convert only supports signed/unsigned and defined FormatSettingsDefinitions
on data whose data type is based upon the AbstractIntegerDataType.

@param action The action to pull information from
@param context The action context
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/equate/ConvertCommand.java