TODO - Refactoring

easier way to define magic tuneable constants
- and maybe to recalculate fixedish things if they change?

Map layer

pt2d resolution
- then my own physics types
maybe also the time to split into different lane types? what's similar/not between them?
- graph querying?
- rendering (and other UI/editor interactions)?
- sim state?
- Sidewalk, Parking, Street

consider refactoring car/ped sim
- basic structure with actions, react, stepping is same. SimQueue, lookahead, can goto? differs.
detangle sim managers... but first, figure out how to capture stacktraces
- manual call at a fxn to dump its stacktrace somewhere (to a file? ideally shared global state to dedupe stuff)
- macro to insert a call at the beginning of a fxn
- macro to apply a macro to all fxns in an impl
- then i can manually edit a few places when I want to gather data
- https://en.wikipedia.org/wiki/File:A_Call_Graph_generated_by_pycallgraph.png
figure out responsibility btwn agents and managers, then fix up visibility
things like ParkingSimState have so many methods -- some are only meant for spawner, or driving/walking to query. separate out some traits.
on a lane vs turn permeates so many places