Greet alg (#83)

* * Moved platforms::Epsilon and base classes to pose namespace
* Modified platforms and algorithms to use new pose::Epsilon and PositionBounds
* Added initial Greet algorithm which moves agents to greeting locations if a target in a list of targets moves within a greeting distance
  * Follow option is not quite working yet
* Added scripts for testing Greet in simulation

* * Updated GAMS repo to style guide
* Updated follow capabilities in the Greet algorithm
* Updated demo scripts for the Greet algorithm
* Removed bazel build files from GAMS

* * Fixing segfault that could occur in GroupFixedList and was causing issues in test_auctions/CI

* * Changing name of joystick script to run_joystick.sh