Refactor data wranglers and make a common factory

[cjgrady]

We need to add data wranglers for trees and matrices (which was always the plan) but the wrangler factory is at the occurrence data wrangler level.

Combine the data wrangler factories and ensure that all data wranglers are included. This may require that data wranglers become subclasses rather than methods.

Todo:

• Create a _DataWrangler base class
• Create an _OccurrenceDataWrangler base class
• Determine how a factory can create instances in a generalized way
• Implement a from_config class method, ideally on one of the base classes
• Accepted Name wrangler
• Attribute modifier wrangler
• Bounding box wrangler
• disjoint geometries wrangler
• intersecting geometries wrangler
• common format wrangler
• decimal precision wrangler
• coordinate conversion wrangler
• minimum points wrangler
• spatial index wrangler
• unique localities wrangler
• Add wranglers to factory
• Tests for wrangler factory