point_features: Create features from a directory of points
In tmp111020/sfe: Spatial Feature Engineering

Create features from a directory of points

1	point_features(dsn, true.loc, labels, crs = 4326)

`dsn`	character string of data directory from where .csv's are stored
`true.loc`	sf object preferably generated from the function true_locations, used for calculating distance from user response to the true locations
`labels`	character vector of short labels to use for locations; needed for generating succinct column names for features
`crs`	coordinate reference system to use for distance calculations