* utility functions
* backend config
* backend object speed tracking
* draw speed on debug view
* basic frontend zone editor
* remove line sorting
* fix types
* highlight line on canvas when entering value in zone edit pane
* rename vars and add validation
* ensure speed estimation is disabled when user adds more than 4 points
* pixel velocity in debug
* unit_system in config
* ability to define unit system in config
* save max speed to db
* frontend
* docs
* clarify docs
* utility functions
* backend config
* backend object speed tracking
* draw speed on debug view
* basic frontend zone editor
* remove line sorting
* fix types
* highlight line on canvas when entering value in zone edit pane
* rename vars and add validation
* ensure speed estimation is disabled when user adds more than 4 points
* pixel velocity in debug
* unit_system in config
* ability to define unit system in config
* save max speed to db
* frontend
* docs
* clarify docs
* fix duplicates from merge
* include max_estimated_speed in api responses
* add units to zone edit pane
* catch undefined
* add average speed
* clarify docs
* only track average speed when object is active
* rename vars
* ensure points and distances are ordered clockwise
* only store the last 10 speeds like score history
* remove max estimated speed
* update docs
* update docs
* fix point ordering
* improve readability
* docs inertia recommendation
* fix point ordering
* check object frame time
* add velocity angle to frontend
* docs clarity
* add frontend speed filter
* fix mqtt docs
* fix mqtt docs
* don't try to remove distances if they weren't already defined
* don't display estimates on debug view/snapshots if object is not in a speed tracking zone
* docs
* implement speed_threshold for zone presence
* docs for threshold
* better ground plane image
* improve image zone size
* add inertia to speed threshold example
