refactor: Move all event handling to the controller

include/errors.hpp

@@ -14,6 +14,7 @@ using std::runtime_error;
 class application_error : public runtime_error {
  public:
   explicit application_error(const string& message, int code = 0) : runtime_error(message), code(code) {}
+  virtual ~application_error() {}
   int code{0};
 };
 
@@ -22,6 +23,7 @@ class system_error : public application_error {
   explicit system_error() : application_error(strerror(errno), errno) {}
   explicit system_error(const string& message)
       : application_error(message + " (reason: " + strerror(errno) + ")", errno) {}
+  virtual ~system_error() {}
 };
 
 #define DEFINE_CHILD_ERROR(error, parent) \