Offer the possibility to override internal formatter objects from plugins

app/Formatter/BoardColumnFormatter.php

@@ -79,7 +79,7 @@ class BoardColumnFormatter extends BaseFormatter implements FormatterInterface
     {
         foreach ($this->columns as &$column) {
             $column['id'] = (int) $column['id'];
-            $column['tasks'] = BoardTaskFormatter::getInstance($this->container)
+            $column['tasks'] = $this->boardTaskFormatter
                 ->withTasks($this->tasks)
                 ->withTags($this->tags)
                 ->withSwimlaneId($this->swimlaneId)

app/Formatter/BoardFormatter.php

@@ -59,7 +59,7 @@ class BoardFormatter extends BaseFormatter implements FormatterInterface
         $task_ids = array_column($tasks, 'id');
         $tags = $this->taskTagModel->getTagsByTasks($task_ids);
 
-        return BoardSwimlaneFormatter::getInstance($this->container)
+        return $this->boardSwimlaneFormatter
             ->withSwimlanes($swimlanes)
             ->withColumns($columns)
             ->withTasks($tasks)

app/Formatter/BoardSwimlaneFormatter.php

@@ -82,7 +82,7 @@ class BoardSwimlaneFormatter extends BaseFormatter implements FormatterInterface
 
         foreach ($this->swimlanes as &$swimlane) {
             $swimlane['id'] = (int) $swimlane['id'];
-            $swimlane['columns'] = BoardColumnFormatter::getInstance($this->container)
+            $swimlane['columns'] = $this->boardColumnFormatter
                 ->withSwimlaneId($swimlane['id'])
                 ->withColumns($this->columns)
                 ->withTasks($this->tasks)

app/Formatter/GroupAutoCompleteFormatter.php

@@ -12,36 +12,26 @@ use PicoDb\Table;
  * @package  formatter
  * @author   Frederic Guillot
  */
-class GroupAutoCompleteFormatter implements FormatterInterface
+class GroupAutoCompleteFormatter extends BaseFormatter implements FormatterInterface
 {
     /**
      * Groups found
      *
-     * @access private
+     * @access protected
      * @var GroupProviderInterface[]
      */
-    private $groups;
+    protected $groups;
 
     /**
-     * Format groups for the ajax auto-completion
+     * Set groups
      *
      * @access public
      * @param  GroupProviderInterface[] $groups
+     * @return $this
      */
-    public function __construct(array $groups)
+    public function withGroups(array $groups)
     {
         $this->groups = $groups;
-    }
-
-    /**
-     * Set query
-     *
-     * @access public
-     * @param  Table $query
-     * @return FormatterInterface
-     */
-    public function withQuery(Table $query)
-    {
         return $this;
     }
 

app/Formatter/UserAutoCompleteFormatter.php

@@ -14,7 +14,7 @@ use Kanboard\Core\Filter\FormatterInterface;
 class UserAutoCompleteFormatter extends BaseFormatter implements FormatterInterface
 {
     /**
-     * Format the tasks for the ajax autocompletion
+     * Format the tasks for the ajax auto-completion
      *
      * @access public
      * @return array