- Field mapper is now removed from Adapters and set into it's own object

- Added a PK to Column (IS)

src/Adapter/SQLite.php

@@ -61,7 +61,7 @@ class SQLite implements AdapterInterface, MigrateInterface, SqlAdapterInterface
     }
 
     # https://sqlite.org/lang_keywords.html
-    public function escapeIdentifier(string $segment, int $type) : string 
+    public static function escapeIdentifier(string $segment, int $type) : string
     {
         switch($type) {
             default: