Replace packr with go embed (#1751)

* Embed performer images
* Embed schema migrations
* Update dependencies
* Embed UI
* Remove remaining packr references

vendor/github.com/jmoiron/sqlx/sqlx.go

@@ -64,11 +64,7 @@ func isScannable(t reflect.Type) bool {
 
 	// it's not important that we use the right mapper for this particular object,
 	// we're only concerned on how many exported fields this struct has
-	m := mapper()
-	if len(m.TypeMap(t).Index) == 0 {
-		return true
-	}
-	return false
+	return len(mapper().TypeMap(t).Index) == 0
 }
 
 // ColScanner is an interface used by MapScan and SliceScan
@@ -149,15 +145,15 @@ func isUnsafe(i interface{}) bool {
 }
 
 func mapperFor(i interface{}) *reflectx.Mapper {
-	switch i.(type) {
+	switch i := i.(type) {
 	case DB:
-		return i.(DB).Mapper
+		return i.Mapper
 	case *DB:
-		return i.(*DB).Mapper
+		return i.Mapper
 	case Tx:
-		return i.(Tx).Mapper
+		return i.Mapper
 	case *Tx:
-		return i.(*Tx).Mapper
+		return i.Mapper
 	default:
 		return mapper()
 	}
@@ -380,6 +376,14 @@ func (db *DB) PrepareNamed(query string) (*NamedStmt, error) {
 	return prepareNamed(db, query)
 }
 
+// Conn is a wrapper around sql.Conn with extra functionality
+type Conn struct {
+	*sql.Conn
+	driverName string
+	unsafe     bool
+	Mapper     *reflectx.Mapper
+}
+
 // Tx is an sqlx wrapper around sql.Tx with extra functionality
 type Tx struct {
 	*sql.Tx