Improve suffix handling for commands.

include/internal/commands/suffixes.h

@@ -6,7 +6,7 @@
 namespace bed::internal::commands {
 struct Suffix {
   std::string desc;
-  void (*handle)(BEd &);
+  void (*handle)(BEd &, std::span<const uint64_t>);
 
   static void register_suffixes(BEd &ctx);
 };