Merge pull request #9 from randikha01/rbi-branch

1. nambah module tree
2. rombak struktur js dan css external-plugins/finder-hcolumn
3. penambahan icon di css/admin_css/stylebackend.css
4. menambahkan tabel tbl_plant_element
5. menambahkan model getElement di plant/models/model_plant.php