protected void setCategory(int cat, int index) {
		category = cat;
		categoryIndex = index;
	}
Set the category and associated index for this symbol. The category indicates a specific sub-class
of symbols. Currently -1=none, 0=parameter, 1=equate
@param cat is the category
@param index is the category index ("slot" for parameters)
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/pcode/HighSymbol.java