Refactor command handling and permissions management

- Updated examples formatting in SetpermCommand and LeaveSettingsCommand for consistency.
- Consolidated the handling of guild targets into a new utility file (servertarget.rs).
- Moved the del command logic to a new utility file (del.rs) for better organization.
- Enhanced the set command functionalities by creating a dedicated set.rs file, improving readability and maintainability.
- Removed deprecated servertarget.rs and del.rs files from the commands directory.
- Improved the help command structure for better readability and maintainability.
- Added new utility files for permissions and server target handling to streamline command processing.

src/commands/config/leavesettings.rs

@@ -143,10 +143,7 @@ impl crate::commands::command_contract::CommandSpec for LeaveSettingsCommand {
             category: "config",
             params: "[on/off] [salon] [message]",
             description: "Configure les actions a executer quand un membre quitte le serveur.",
-            examples: &[
-                "+leavesettings",
-                "+leavesettings on #logs {user} a quitte",
-            ],
+            examples: &["+leavesettings", "+leavesettings on #logs {user} a quitte"],
             default_aliases: &["lset"],
             allow_in_dm: false,
             default_permission: 5,