CI4 bugfixes

- Added session variable instantiation where needed.
- Added tabular helper to autoload
- removed tabular helper reference where no longer needed.
- Remove esc() references where it was causing display problems.
- Remove excess whitespace on blank line
- Remove unecessary using reference
- Make parameters for dinner table functions nullable

app/Models/Dinner_table.php

@@ -46,7 +46,7 @@ class Dinner_table extends Model
 	/**
 	 * Get empty tables
 	 */
-	public function get_empty_tables(int $current_dinner_table_id): array
+	public function get_empty_tables(?int $current_dinner_table_id): array
 	{
 		$builder = $this->db->table('dinner_tables');
 		$builder->where('status', 0);