Inject global value

Add a rule that can inject a global variable. For example, the following settings would replace all usage of someVariableName with literal string "hello!"

{
    rule: "inject_global_value",
    identifier: "someVariableName",
    value: "hello!",
}

The value field could accept a number, a string, an array or a map (those last two would be converted to a Lua tables).