refactor: move UnitNames to top level package

patch.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"fmt"
 	"math"
+	"sort"
 )
 
 type (
@@ -178,6 +179,18 @@ const (
 	Sample = iota
 )
 
+// UnitNames is a list of all the names of units, sorted
+// alphabetically.
+var UnitNames []string
+
+func init() {
+	UnitNames = make([]string, 0, len(UnitTypes))
+	for k := range UnitTypes {
+		UnitNames = append(UnitNames, k)
+	}
+	sort.Strings(UnitNames)
+}
+
 // Ports is static map allowing quickly finding the parameters of a unit that
 // can be modulated. This is populated based on the UnitTypes list during
 // init(). Thus, should be immutable, but Go not supporting that, then this will