adding possibility for node options & parameter for changing scan topic #50
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Parameters did not have a way to be changed via a launch or config file, so they needed to be hard-coded in sllidar_node.cpp. This adds the capability to have those parameters be found from launch or config files without having to hardcode values in the parameter declarations in the cpp file. Also added a specific parameter using node options for changing the topic that is referred to for laser scans.