Standardize the use of edge_filter and edge_filter_kw for all methods.

[WilliamJudge94]

We're going to include a second way of making masks based on image constrast instead of spectroscopy data. We need to stardardize all the methods that use edge_filter to accept a string determining which approach should be used. Also docs need to be updated.

[WilliamJudge94]

I will be using frame_filter and frame_filter_kw

[WilliamJudge94]

Add documentation