hot-reloading for dasm_cache, in case of filesystem changes; file stream layer -> expose filesystem-wide generation number, for very coarse-grained generation number to gracefully depend on filesystem changes passively

src/df/gfx/df_gfx.c

@@ -11697,7 +11697,7 @@ df_gfx_begin_frame(Arena *arena, DF_CmdList *cmds)
   }
   
   //- rjf: capture is active? -> keep rendering
-  if(ProfIsCapturing())
+  if(ProfIsCapturing() || DEV_telemetry_capture)
   {
     df_gfx_request_frame();
   }