Implement workaround for #1625

This workaround is a good one as it just creates a default value that is
release

Author: jan

io.sloeber.core/config/pre_processing_platform_default.txt

@@ -40,3 +40,5 @@ serial.port.file=${serial.port}
 upload.altID=no_altID
 upload.usbID=no_altID
 
+#workaround and default value for issue #1625
+compiler.optimization_flags=${compiler.optimization_flags.release}