Send ext. tools regular update events while emulation is paused

resolves #3626

Author: YoshiRulz

src/BizHawk.Client.EmuHawk/MainForm.cs

@@ -881,10 +881,13 @@ public int ProgramRunLoop()
 				// autohold/autofire must not be affected by the following inputs
 				InputManager.ActiveController.Overrides(InputManager.ButtonOverrideAdapter);
 
+				// emu.yield()'ing scripts
 				if (Tools.Has<LuaConsole>())
 				{
 					Tools.LuaConsole.ResumeScripts(false);
 				}
+				// ext. tools don't yield per se, so just send them a GeneralUpdate
+				Tools.GeneralUpdateActiveExtTools();
 
 				StepRunLoop_Core();
 				Render();

src/BizHawk.Client.EmuHawk/tools/ToolManager.cs

@@ -580,6 +580,14 @@ public void UpdateValues<T>() where T : IToolForm
 			}
 		}
 
+		public void GeneralUpdateActiveExtTools()
+		{
+			foreach (var tool in _tools.ToArray())
+			{
+				if (tool is IExternalToolForm { IsActive: true }) tool.UpdateValues(ToolFormUpdateType.General);
+			}
+		}
+
 		public void Restart(Config config, IEmulator emulator, IGameInfo game)
 		{
 			_config = config;