Modularizing Exposure(+) Workflow End to End.

[atambay37]

Important to decide how we split the following individual steps up (whether each step is its a container?? or it's own script rather than the current state which each it's own function and they are chained into a script:

1. Prepare Climate Data
2. Prepare Species Data
3. Combine and transform
4. Estimate Niche Limits
5. Calculate Exposure
6. Calculate Exposure Indicators
7. Skills Eval

What are the implications of each of these options for modularizing. And how does it make things like #164 eacsier?