1.2.0 (2020-05-27)

Moved methods in substitution module into ArgumentResolver class.
Added handling of executables and resources for $(find ...) commands.
Fixed handling of namespaces for node elements in XML launch files.
Fixed handling of $(optenv ...) tags in XML launch files.
Fixed handling of launch-prefix for node elements in XML launch files.
Fixed bad type annotation in proxy.launch.substitution that broke Python
3.6 compatibility.
Moved all logging from Python's built-in logging library to loguru.
Added to_xml_tree method to LaunchConfig.
Added PackageNotFound and LaunchFileNotFound exception.
Added roslaunch property to ROSCore, which exposes a ROSLaunchManager.
The manager provides various roslaunch-related functionality including
locating, generating, parsing, flattening, and launching launch files.
Removed launch method from ROSCore. Replaced with roslaunch.

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