Batch prepare and allow limited buffering for vulkan initial states

* We add a capture option that defines a soft limit we aim to keep under for
  memory overhead during capture, excess initial states after that will be
  stored temporarily on disk.

renderdoccmd/renderdoccmd.cpp

@@ -1639,6 +1639,9 @@ int renderdoccmd(GlobalEnvironment &env, std::vector<std::string> &argv)
               "Capturing Option: Include all live resources, not just those used by a frame.");
       cmd.add("opt-capture-all-cmd-lists", 0,
               "Capturing Option: In D3D11, record all command lists from application start.");
+      cmd.add<int>("opt-soft-memory-limit", 0,
+                   "Capturing Option: Specify a soft memory limit to try to respect.", false, 0,
+                   cmdline::range(0, 10000));
     }
 
     cmd.parse_check(argv, true);
@@ -1670,6 +1673,7 @@ int renderdoccmd(GlobalEnvironment &env, std::vector<std::string> &argv)
         opts.captureAllCmdLists = true;
 
       opts.delayForDebugger = (uint32_t)cmd.get<int>("opt-delay-for-debugger");
+      opts.softMemoryLimit = (uint32_t)cmd.get<int>("opt-soft-memory-limit");
     }
 
     if(!it->second->HandlesUsageManually() && cmd.exist("help"))