[roslaunch] add 'command' attribute to 'arg' tag #2229
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There is very useful feature of setting parameter value from shell command output (attribute 'command' of 'param' tag). But the functionality is too limited: it is impossible to pass a command result to included launch or to node arguments. Extending this feature to arguments provides more ability for customization. It resolves #1767. Also, it can be used as a workaround for problem, described in #723