Add menu option for filter method to use when scaling video.

src/include/86box/86box.h

@@ -90,6 +90,7 @@ extern int	vid_cga_contrast,		/* (C) video */
 		video_fullscreen_scale,		/* (C) video */
 		enable_overscan,		/* (C) video */
 		force_43,			/* (C) video */
+		video_filter_method,		/* (C) video */
 		video_vsync,			/* (C) video */
 		video_framerate,		/* (C) video */
 		gfxcard;			/* (C) graphics/video card */

src/include/86box/resource.h

@@ -333,9 +333,11 @@
 #define IDM_VID_GRAY_AMBER	40082
 #define IDM_VID_GRAY_GREEN	40083
 #define IDM_VID_GRAY_WHITE	40084
+#define IDM_VID_FILTER_NEAREST	40085
+#define IDM_VID_FILTER_LINEAR	40086
 
-#define IDM_MEDIA		40085
-#define IDM_DOCS		40086
+#define IDM_MEDIA		40087
+#define IDM_DOCS		40088
 
 #ifdef USE_DISCORD
 #define IDM_DISCORD		40090

src/include/86box/win_sdl.h

@@ -11,10 +11,10 @@
  *
  *
  * Authors:	Fred N. van Kempen, <decwiz@yahoo.com>
- *		Michael Dr<EFBFBD>ing, <michael@drueing.de>
+ *		Michael Drüing, <michael@drueing.de>
  *
  *		Copyright 2018,2019 Fred N. van Kempen.
- *		Copyright 2018,2019 Michael Dr<EFBFBD>ing.
+ *		Copyright 2018,2019 Michael Drüing.
  *
  *		Redistribution and  use  in source  and binary forms, with
  *		or  without modification, are permitted  provided that the
@@ -58,6 +58,6 @@ extern int	sdl_pause(void);
 extern void	sdl_resize(int x, int y);
 extern void	sdl_enable(int enable);
 extern void	sdl_set_fs(int fs);
-
+extern void	sdl_reload(void);
 
 #endif	/*WIN_SDL_H*/