tool/exchange_wrapper_coverage: fix regression and implement reflection (#837)

* cmd/tools/exchange: fix regression and implement reflection so as this can dynamically scale to our interface

* exchanges: add comment and fix whoopsie

* exchanges: fix linter issues

* wrapper_cov_tool: add actual full interface method count to get a better perceived deployment

* exchanges/tool: addr glorious nits

* kraken: remove string in test

* exchange_template_tool: fix tmpl issue

gctscript/vm/manager.go

@@ -6,6 +6,7 @@ import (
 	"sync"
 	"sync/atomic"
 
+	"github.com/thrasher-corp/gocryptotrader/common"
 	"github.com/thrasher-corp/gocryptotrader/log"
 )
 
@@ -46,6 +47,9 @@ func (g *GctScriptManager) IsRunning() bool {
 
 // Start starts gctscript subsystem and creates shutdown channel
 func (g *GctScriptManager) Start(wg *sync.WaitGroup) (err error) {
+	if wg == nil {
+		return fmt.Errorf("%T %w", wg, common.ErrNilPointer)
+	}
 	if !atomic.CompareAndSwapInt32(&g.started, 0, 1) {
 		return fmt.Errorf("%s %s", caseName, ErrScriptFailedValidation)
 	}