Converted grid and its tests (#4085)

* Refactored grid

* Got test to pass

* Uncommented deleted pointers

* Removed label from nn

* Removed functors and added lambda expressions. Got bandDependent test to pass.

* Fixed copy/paste error.

* Added grid tests

* Added grid tests, added leisa cube fixture, and updated default cube fixture to contain image data

* Removed log from grid

* removed grid tests

* Added history entry

* forced real DNs in hirise

* Changed LEISA cube to use new pointing info

* MRO, for REALsies

Co-authored-by: Kelvin <kelvinrr@icloud.com>