update start values in ssv template

[arun3688]

Related Issues

#951

Purpose

This PR updates the new start values for signals exported in ssv template files set via setReal or setInteger or setBoolean

example

oms_newModel("test")
oms_addSystem("test.Root", oms_system_wc)
oms_addSubModel("test.Root.Gain", "../resources/Modelica.Blocks.Math.Gain.fmu")
oms_setReal("test.Root.Gain.k", 27)
oms_addSubModel("test.Root.add", "../resources/Modelica.Blocks.Math.Add.fmu")
oms_setReal("test.Root.add.k1", -20)
oms_exportSSVTemplate("test", "template.ssv")