map generator output folder

[jgueldenstein]

Proposed changes

this pr creates an option to specify an output folder and optionally a ros package If no ros package is specified, the rospkg package is not imported, removing the ros dependency

Related issues

60

Necessary checks

• [ ] Update package version
• [ ] Run catkin build
• [ ] Write documentation
• [ ] Create issues for future work
• [x] Test on your machine
• [ ] Test on the robot
• [x] Put the PR on our Project board