AddSetVarToPreset creates a SetVar that is independant of any UserInput during the creation of a job preset.
It enables the creation of variables independently of UserInput instructions.
Any unreserved name valid in XML. Reserved names are listed on: Variables
Any string or number
<AddSetVarToPreset var1="xyz" var2="abc"/>
When this instruction is met in a job, the following is added to the preset under construction:
<SetVar var1="xyz" var2="abc"/>