move metadata out of core into its own module file

src/modules/mod.rs

@@ -8,6 +8,7 @@ pub mod cloak;
 pub mod dnsbl;
 pub mod filter;
 pub mod flood;
+pub mod metadata;
 pub mod snoop;
 
 use crate::command::Command;
@@ -21,11 +22,15 @@ pub fn default_modules() -> Vec<Box<dyn Module>> {
         Box::new(cloak::Cloak),
         Box::new(antimixedutf8::AntiMixedUtf8),
         Box::new(filter::Filter),
+        Box::new(metadata::Metadata),
     ]
 }
 
 /// Commands contributed by modules (chained into the core command table), so a
 /// module that adds a command keeps it in its own file, InspIRCd-style.
 pub fn module_commands() -> Vec<Box<dyn Command>> {
-    filter::commands().into_iter().collect()
+    filter::commands()
+        .into_iter()
+        .chain(metadata::commands())
+        .collect()
 }