Add support for command permissions to the framework

src/framework/commands/mod.rs

@@ -9,6 +9,7 @@ pub mod arguments;
 pub mod context;
 pub mod messages;
 pub mod runner;
+pub mod permissions;
 
 #[derive(Debug, Error)]
 pub enum CommandError {
@@ -37,6 +38,9 @@ pub trait Command<T>: Send + Sync + Debug {
     fn arguments(&self) -> &'static [Argument] {
         &[]
     }
+    fn permissions(&self) -> &'static [Box<dyn permissions::Permission<T> + Send + Sync>] {
+        &[]
+    }
 
     /// Returns the command name + all its aliases.
     ///