Command: Added DNA for commands

src/commands/Command.h

@@ -45,6 +45,11 @@ public:
   std::string description () const;
   bool read_only () const;
   bool displays_id () const;
+  bool needs_gc () const;
+  bool uses_context () const;
+  bool accepts_filter () const;
+  bool accepts_modifications () const;
+  bool accepts_miscellaneous () const;
   virtual int execute (std::string&) = 0;
 
   enum class Category
@@ -76,6 +81,11 @@ protected:
   bool        _read_only;
   bool        _displays_id;
   bool        _needs_confirm;
+  bool        _needs_gc;
+  bool        _uses_context;
+  bool        _accepts_filter;
+  bool        _accepts_modifications;
+  bool        _accepts_miscellaneous;
 
   // Permission support
   bool        _permission_quit;