Pass globals to DisplayManager as with OSDManager

* moved initialisation of global `OSDManager` to `DisplayManager` ctor again
* `DisplayManager.UpdateGlobals` calls `DisplayManager.OSD.UpdateGlobals`
* goodbye `GlobalWin.Emulator` and `GlobalWin._mainForm` :)

src/BizHawk.Client.EmuHawk/DisplayManager/DisplayManager.cs

@@ -51,13 +51,15 @@ namespace BizHawk.Client.EmuHawk
 
 		public readonly OSDManager OSD;
 
-		private Config GlobalConfig => GlobalWin.Config;
+		private Config GlobalConfig;
 
-		private IEmulator GlobalEmulator => GlobalWin.Emulator;
+		private IEmulator GlobalEmulator;
 
-		public DisplayManager(OSDManager osd, IGL gl, PresentationPanel presentationPanel, Func<bool> getIsSecondaryThrottlingDisabled)
+		public DisplayManager(Config config, IEmulator emulator, InputManager inputManager, IMovieSession movieSession, IGL gl, PresentationPanel presentationPanel, Func<bool> getIsSecondaryThrottlingDisabled)
 		{
-			OSD = osd;
+			GlobalConfig = config;
+			GlobalEmulator = emulator;
+			OSD = new OSDManager(config, emulator, inputManager, movieSession);
 			_getIsSecondaryThrottlingDisabled = getIsSecondaryThrottlingDisabled;
 			_gl = gl;
 
@@ -136,6 +138,13 @@ namespace BizHawk.Client.EmuHawk
 			RefreshUserShader();
 		}
 
+		public void UpdateGlobals(Config config, IEmulator emulator)
+		{
+			GlobalConfig = config;
+			GlobalEmulator = emulator;
+			OSD.UpdateGlobals(config, emulator);
+		}
+
 		public bool Disposed { get; private set; }
 
 		public void Dispose()

src/BizHawk.Client.EmuHawk/GlobalWin.cs

@@ -1,15 +1,10 @@
 using BizHawk.Client.Common;
-using BizHawk.Emulation.Common;
 
 // ReSharper disable StyleCop.SA1401
 namespace BizHawk.Client.EmuHawk
 {
 	public static class GlobalWin
 	{
-		public static MainForm _mainForm { get; set; }
-
-		public static IEmulator Emulator => _mainForm.Emulator;
-
 		public static Sound Sound;
 
 		public static Config Config { get; set; }

src/BizHawk.Client.EmuHawk/MainForm.cs

@@ -279,8 +279,6 @@ namespace BizHawk.Client.EmuHawk
 			Database.InitializeDatabase(Path.Combine(PathUtils.ExeDirectoryPath, "gamedb", "gamedb.txt"));
 			BootGodDb.Initialize(Path.Combine(PathUtils.ExeDirectoryPath, "gamedb"));
 
-			GlobalWin._mainForm = this;
-
 			_config = config; // skips assignment to GlobalWin.Config as Program already did that
 			GL = gl;
 
@@ -339,7 +337,7 @@ namespace BizHawk.Client.EmuHawk
 			{
 				GraphicsControl = { MainWindow = true }
 			};
-			DisplayManager = new DisplayManager(new OSDManager(Config, Emulator, InputManager, MovieSession), GL, _presentationPanel, () => DisableSecondaryThrottling);
+			DisplayManager = new DisplayManager(Config, Emulator, InputManager, MovieSession, GL, _presentationPanel, () => DisableSecondaryThrottling);
 			Controls.Add(_presentationPanel);
 			Controls.SetChildIndex(_presentationPanel, 0);
 
@@ -2796,7 +2794,7 @@ namespace BizHawk.Client.EmuHawk
 			InputManager.SyncControls(Emulator, MovieSession, Config);
 			Tools.Restart(Config, Emulator, Game);
 			ExtToolManager.Restart(Config.PathEntries);
-			OSD.UpdateGlobals(Config, Emulator);
+			DisplayManager.UpdateGlobals(Config, Emulator);
 			AddOnScreenMessage($"Config file loaded: {iniPath}");
 		}
 
@@ -3773,7 +3771,7 @@ namespace BizHawk.Client.EmuHawk
 					CurrentlyOpenRom = oaOpenrom?.Path ?? openAdvancedArgs;
 					CurrentlyOpenRomArgs = args;
 					OnRomChanged();
-					OSD.UpdateGlobals(Config, Emulator);
+					DisplayManager.UpdateGlobals(Config, Emulator);
 					DisplayManager.Blank();
 					CreateRewinder();
 
@@ -3923,7 +3921,7 @@ namespace BizHawk.Client.EmuHawk
 				Tools.Restart(Config, Emulator, Game);
 				RewireSound();
 				ClearHolds();
-				OSD.UpdateGlobals(Config, Emulator);
+				DisplayManager.UpdateGlobals(Config, Emulator);
 				InputManager.SyncControls(Emulator, MovieSession, Config);
 				Tools.UpdateCheatRelatedTools(null, null);
 				PauseOnFrame = null;