change "NDAttributes.xsd" to support .xml containing macro characters, $, (, )

[cpchuang]

current "NDAttributes.xsd" invalidate .xml files containing $, (, )

Validating xml file against "./XML_schema/NDAttributes.xsd"
Attri_ADsim.xml:9: element Attribute: Schemas validity error : Element 'Attribute', attribute 'source': '$(P)cam1:Manufacturer_RBV' is not a valid value of the union type 'type_source'.

After discussing with @prjemian , propose the following changes to include $, (, ),

    <xs:restriction base="xs:string"> <!-- Changed from xs:NMTOKEN to xs:string -->
      <xs:pattern value="[\w_\-:.;\$\(\)]+([.][A-Z0-9]+)?"/>   <!-- include $, (, ),  -->
    </xs:restriction>
  </xs:simpleType>

[cpchuang]

for clarity,
Here is the example attributes.xml

and how macro is added in AD.

[MarkRivers]

Can you please submit a PR for this?