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GCC 9 Compability

When trying to build ROSPlan for noetic, the compilation fails, because GCC9 deprecated implicit copies, see:

/build/turtlebot/src/ROSPlan/rosplan_dependencies/rddl_parser/task_analyzer.cc: In member function ‘void TaskAnalyzer::analyzeTask(int, int)’:
/build/turtlebot/src/ROSPlan/rosplan_dependencies/rddl_parser/task_analyzer.cc:29:43: error: implicitly-declared ‘State& State::operator=(const State&)’ is deprecated [-Werror=deprecated-copy]
   29 |             currentState = State(nextState);
      |                                           ^
In file included from /build/turtlebot/src/ROSPlan/rosplan_dependencies/rddl_parser/task_analyzer.h:4,
                 from /build/turtlebot/src/ROSPlan/rosplan_dependencies/rddl_parser/task_analyzer.cc:1:
/build/turtlebot/src/ROSPlan/rosplan_dependencies/rddl_parser/states.h:22:5: note: because ‘State’ has user-provided ‘State::State(const State&)’
   22 |     State(State const& other) : state(other.state) {}
      |     ^~~~~
/build/turtlebot/src/ROSPlan/rosplan_dependencies/rddl_parser/task_analyzer.cc:31:44: error: implicitly-declared ‘State& State::operator=(const State&)’ is deprecated [-Werror=deprecated-copy]
   31 |             currentState = State(task->CPFs);
      |                                            ^
In file included from /build/turtlebot/src/ROSPlan/rosplan_dependencies/rddl_parser/task_analyzer.h:4,
                 from /build/turtlebot/src/ROSPlan/rosplan_dependencies/rddl_parser/task_analyzer.cc:1:
/build/turtlebot/src/ROSPlan/rosplan_dependencies/rddl_parser/states.h:22:5: note: because ‘State’ has user-provided ‘State::State(const State&)’
   22 |     State(State const& other) : state(other.state) {}
      |     ^~~~~
cc1plus: all warnings being treated as errors

also see e.g. tsduck/tsduck#205 for the background and a workaround.

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