spatialising 1.0.0

New features

• Added spatially varying external pressure through the new external_field argument to kinetic_ising().
• Added support for spatial masks: NA cells are excluded from the simulation and no longer contribute neighbor pressure.
• Added a vignette showing how probability maps can guide kinetic Ising simulations.

Bug fixes

• Cell locations are now sampled uniformly during simulation. Previously, cells on the outer rows and columns were selected less often than interior cells.
• composition_index() now ignores masked cells consistently for matrices and rasters.