Revert "checkpoint on pass to majorly simplify debug frontend state, and eliminate df entities, and move from cmds -> msgs"

This reverts commit 06a685221a.

src/base/base_entry_point.c

@@ -80,7 +80,7 @@ main_thread_base_entry_point(void (*entry_point)(CmdLine *cmdline), char **argum
   d_init(&cmdline, hist);
 #endif
 #if defined(DBG_FRONTEND_CORE_H) && !defined(DF_INIT_MANUAL)
-  df_init();
+  df_init(update_and_render, d_state_delta_history());
 #endif
   
   //- rjf: call into entry point