Add GenericObject plugin files and assets

- Introduced default icon images in PNG and SVG formats.
- Added example icons for car and cube in SVG format.
- Created setup file for the GenericObject plugin with versioning and directory definitions.
- Included a header file with licensing information for the plugin.
- Added a remove.txt file with instructions for safe deletion.

.gitignore

@@ -1,33 +1,4 @@
-/config/config_db*
-/config/config_path.php
-/config/local_define.php
-/tests/config_db*
-/plugins/
-/files/
-/.buildpath
-/.project
-/.settings/
-/.vscode/
-/.idea/
-/tools/composer.lock
-/tools/vendor/
-/tools/api/
-/tools/htmlcov/
-/vendor/
-phpunit.xml
-/tests/code-coverage/
-/tests/files/
-/config/based_config.php
-/config/config.php
-/config/define.php
-/nbproject
-.composer.hash
-/css/**/*.min.css
-/css/compiled/
-!/css/tiny_mce/**/*.min.css
-/js/*.min.js
-# ignore incomplete locale, fallback to ru.js
-# see https://github.com/glpi-project/glpi/issues/3788
-/lib/tiny_mce/langs/ru_RU.js
+/vendor
 /file_upload
-/fiche_eval_upload
+/fiche_eval_upload
+/files