[workaround DOOCS bug] set timestamp of all writeable properties at start

This is a workaround for the following DOOCS bug:
https://rt-system.desy.de/Ticket/Display.html?id=985653

include/DoocsProcessArray.h

@@ -60,6 +60,9 @@ namespace ChimeraTK {
       // send the current value to the device
       if(_processArray->isWriteable()) {
         sendToDevice();
+        // set DOOCS time stamp, workaround for DOOCS bug (get() always gives current time stamp if no timestamp is set,
+        // which breaks consistency check in ZeroMQ subscriptions after the 4 minutes timeout)
+        DOOCS_T::set_stamp();
       }
     }
 

include/DoocsProcessScalar.h

@@ -143,6 +143,9 @@ namespace ChimeraTK {
       if(_processScalar->isWriteable()) {
         _processScalar->accessData(0) = DOOCS_T::value();
         _processScalar->write();
+        // set DOOCS time stamp, workaround for DOOCS bug (get() always gives current time stamp if no timestamp is set,
+        // which breaks consistency check in ZeroMQ subscriptions after the 4 minutes timeout)
+        DOOCS_T::set_stamp();
       }
     }
 

src/DoocsSpectrum.cc

@@ -77,6 +77,9 @@ namespace ChimeraTK {
     modified = false;
     if(_processArray->isWriteable()) {
       sendToDevice();
+      // set DOOCS time stamp, workaround for DOOCS bug (get() always gives current time stamp if no timestamp is set,
+      // which breaks consistency check in ZeroMQ subscriptions after the 4 minutes timeout)
+      D_spectrum::set_stamp();
     }
   }