updated timer creation to match the documented and correct way specified in latest rclpy version

[geoporus1]

Addresses #17:

• Updated the 2 creation of timers in controller_ros.py to match the latest rclpy documentation. Now the node doesn't crash anymore with wrong import when setting use_standard_msgs to True and autorepeat_rate to something different than 0.
• Created run_bringup script for more easily launching the provided Docker container. The bringup mounts the whole /dev folder into the container as this is a quick fix for the controller not disconnecting properly and keeping the previous HIDRAW file locked. This would lead to the creation of a new HIDRAW file which cannot be possible set as a --device before running the container. the bringup also includes an environment variable for mounting the source of the package inside the container for easier development if needed. This can be removed if deemed unnecessary.
• Updated the README

Later edits:

• updated the run_bringup.bash and README.md according to suggestions from @naoki-mizuno

[naoki-mizuno]

Thanks! I'll try out your patch once I get the chance. In the mean time, I added some minor comments.

[geoporus1]

@naoki-mizuno Thank you for the quick reply! I will address your comments and change the things according to your advice! Hope that you will soon get to try out the patch and we can merge it! Best of luck to you and hope to hear from you soon! :)

[naoki-mizuno]

I was able to confirm that 1, setting use_stardard_msgs and autorepeat_rate causes the crash (as mentioned in https://github.com/naoki-mizuno/ds4_driver/issues/17#issuecomment-851425171) and 2, with your patch this issue is fixed. If you can resolve the two review comments above I'm happy to go ahead and merge this :) Thanks!

[geoporus1]

@naoki-mizuno the 2 review comments above have been resolved! Happy I could help! Please check if the new updates are ok for you and you can merge this whenever you can! :)

[naoki-mizuno]

Wonderful! Thank you!