orderbook: Refactor package structure for simplicity and efficiency (#1465)

* initial purge and benchmarks proof before rn overhaul

* rn LinkedList -> Tranche(s) and purge references

* roll out acrost exchanges

* linterino

* rn silly billy label

* linter strikes AAAAAGAIN!

* fix some things

* rm comment

* Add actual comparison from master to branch benchmark for sorting algorithms

* lower case via git mv YAAY!

* drop code

* convert type name

* glorious: nits

---------

Co-authored-by: Ryan O'Hara-Reid <ryan.oharareid@thrasher.io>

gctscript/wrappers/validator/validator.go

@@ -55,13 +55,13 @@ func (w Wrapper) Orderbook(_ context.Context, exch string, pair currency.Pair, i
 		Exchange: exch,
 		Asset:    item,
 		Pair:     pair,
-		Bids: []orderbook.Item{
+		Bids: []orderbook.Tranche{
 			{
 				Amount: 1,
 				Price:  1,
 			},
 		},
-		Asks: []orderbook.Item{
+		Asks: []orderbook.Tranche{
 			{
 				Amount: 1,
 				Price:  1,