AIRO-358: HUD (#41)

* ToString override parser

* Expandable HUD panel with message contents

* Added ToString overrides to common_msgs

* ROSConnection Hud - some rewrites (#49)

* Regenerating common, ros-tcp, std msgs (#50)

* Instantiate HUD only if showHUD

* Minor cleanup

* Delete extra metafiles

Co-authored-by: LaurieCheers-unity <73140792+LaurieCheers-unity@users.noreply.github.com>