Upgrade Snowflake to ROS Noetic and Ubuntu 20.04

[ihsan314]

Description

Upgraded repo to ROS Noetic and switched to installing the realsense library via apt.

Testing Done

Verified in a docker container that all dependencies were installed and that catkin_make succeeded.

Resolved Issues

Resolves #384

Review Checklist

(Please check every item to indicate your code complies with it (by changing [ ]->[x]). This will hopefully save both you and the reviewer(s) a lot of time!)
It is the reviewers responsibility to also make sure every item here has been covered

• Start of document comments: each .cpp and .h file should have a comment at the start of it. See files in src/sample_package for examples.
• Function comments: All function definitions (usually in the .h file) should have a javadoc style comment at the start of them. For examples, see the classes defined in src/sample_package
• Remove all commented out code
• Remove extra print statements: for example, those just used for testing
• Resolve all TODO's: All TODO (or similar) statements should either be completed or associated with a github issue
  Feel free to make additions of things that we should be checking to this file if you think there's something missing!!!!