Use a common function to abort for debugging purposes

src/entry_handler.cpp

@@ -166,6 +166,18 @@ namespace lifetime {
     }
   }
 
+  /**
+   * @brief Breaks into the debugger or terminates Sunshine if no debugger is attached.
+   */
+  void
+  debug_trap() {
+#ifdef _WIN32
+    DebugBreak();
+#else
+    std::raise(SIGTRAP);
+#endif
+  }
+
   /**
    * @brief Gets the argv array passed to main().
    */