single.step: Perform a single (generation) step for the population
In pwhigham/spatibm: A Spatial Individual-based model for land-based organisms

Perform a single step for a population based on their defined breeding, survival, and crowding parameters and the habitat surface. This function is only called when the user requires fine-grained control over changes to the population each generation.

1 2	single.step(curr.pop, move.table, survive.table, breed.table, habitat.surface, crowd.table = NA, crowding.sigma = 0, max.dist = 5)

`curr.pop`	The current population as a .ppp
`move.table`	Movement table as defined by `movement.table`.
`survive.table`	Survival table as defined by `survival.table`.
`breed.table`	Breeding table as defined by `breeding.table`
`habitat.surface`	The habitat (probability) surface. See `circle.habitat` for an example, although this surface could be produced in many ways. The only requirement is that it must cover the entire window associated with the population.
`crowd.table`	The crowding table as defined by `crowding.table`. May be NA for no crowding.
`crowding.sigma`	Bandwidth used for density calculation for crowding. Value of 0.0 indicates no crowding.
`max.dist`	Maximum distance between breeding parents