Small DW in CollectionCost should filter on a particular equipment type

[parangat94]

Currently, small Distributed Wind (DW) model extension (< 100 kW machine rating) in CollectionCost.py uses a check to see if equipment rental cost is < $137. This $137 is the cost of renting a walk behind trencher for a single day.

This 137 is hard coded into the IF statement; this is not the cleanest implementation and is prone to introducing bugs into the code down the line and will be hard to maintain if this $137/day value changes.

Implement functionality in the code to filter out equipment by type; and also make sure to remove this hard coded $137 value and instead add the cost of rental ($/day) in the inputs spreadsheet so it is easier to maintain that way.