protected boolean allowsBitFields() {
		return true;
	}
Determine if the data type is a valid one to place into the current structure being edited.
If invalid, an exception will be thrown.

@param datatype the data type
@throws InvalidDataTypeException if the structure being edited is part
        of the data type being inserted or doesn't have a valid size.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/compositeeditor/CompositeEditorModel.java