Add fireflow module using wind and elevation etc.

[calexat-123]

See if xrspatial tools can be used to model and predict fire direction and growth and smoke flow based on winds, elevation, and/or other factors. Related to weather and hydrology issues #194, #92, #93, #94, #95, #96, #97, #98, #99, #100, #17. First glance literature sources:

• USDA BlueSky model
• NASA FLAMBE program