Add localMin on rasters.
Add max on rasters.
Add mask on raster.
Merge branch 'master' into localops
Add Pow operation.

Needs a unit test for sequence still.
Renamed TileIdRaster to Tile, refactoring out type aliases.
Fixed tests.
Removed additional type aliases, more refactors.
Include right associative tests for localPow.
Merge branch 'master' into localops
Finish local inverse mask on raster.
Finish localDefined on Raster.
Finish localUndefined method on Raster.
Finish local methods for sqrt and round.
Finish localLog.
Finish local ceil and floor.
Add methods for localNegate.
Add local not method to raster.
Start work on And.

Having trouble with the sequence tests.
Removed withContext package method; use mapTiles & combineTiles