message: franka_msgs: Simplify CMakeLists.txt.
diff: cmake_minimum_required(VERSION 2.8.3)
  project(franka_msgs)
  -list(INSERT CMAKE_MODULE_PATH 0 ${CMAKE_CURRENT_SOURCE_DIR}/../cmake)
  -
  -set(CMAKE_CXX_STANDARD 14)
  -set(CMAKE_CXX_STANDARD_REQUIRED ON)
  -
  -find_package(catkin REQUIRED COMPONENTS
  - message_generation
  - std_msgs
  -)
  -
  -add_message_files(FILES
  - Errors.msg
  - FrankaState.msg
  -)
  +find_package(catkin REQUIRED COMPONENTS message_generation std_msgs)
  +add_message_files(FILES Errors.msg FrankaState.msg)
  generate_messages(DEPENDENCIES std_msgs)
  -
  -catkin_package(
  - CATKIN_DEPENDS message_runtime std_msgs
  -)
  +catkin_package(CATKIN_DEPENDS message_runtime std_msgs)
  