Resolve "Implement ffi_ZDC"

https://gitlab.com/eic/escalate/g4e/-/blob/master/src/subdetectors/ffi_ZDC/ffi_ZDC.hh

Closes #30 (closed)

compact/definitions.xml

@@ -423,6 +423,7 @@
     </comment>
     <comment> BeamLines: IP6 </comment>
     <constant name="ffi_ZDC_x_pos"         value="90.0 * cm"/>
+    <constant name="ffi_ZDC_y_pos"         value="0.0 * cm"/>
     <constant name="ffi_ZDC_z_pos"         value="3800.0 * cm"/>
     <constant name="ffi_ZDC_rotateX_angle" value="0.0 * rad"/>
     <constant name="ffi_ZDC_rotateY_angle" value="-0.0125 * rad"/>
@@ -430,6 +431,7 @@
 
     <comment> BeamLines: IP8 </comment>
     <!--<constant name="ffi_ZDC_x_pos"     value="127.0 * cm"/>
+    <constant name="ffi_ZDC_y_pos"         value="0.0 * cm"/>
     <constant name="ffi_ZDC_z_pos"         value="3600.0 * cm"/>
     <constant name="ffi_ZDC_rotateX_angle" value="0.0 * rad"/>
     <constant name="ffi_ZDC_rotateY_angle" value="-0.025 * rad"/>