A lot of changes

- Fix the broken itemindex of ComboBox  in the Settings dialog
- Change from LCID to uint32_t
- Rewrite the headers of the lang related functions (can handle the whole LCID as input)
- Add dummy functions to unix.c
- Add proper combobox handling in win_settings.c
- Added a lot of debug calls temporarily
- Reactivate every disabled option related to language changes
- Move lang_id to 86box.h from win.h
- Implement on-fly resource switch as discussed with OBattler
- Reimplement everything language related in the initialization section of the program
- Implemented the ladder of three points
1, what is the --lang?
2, what are definied in the config? (to be implemented)
3, what is the system language

src/include/86box/86box.h

@@ -15,6 +15,7 @@
  *
  *		Copyright 2016-2020 Miran Grca.
  *		Copyright 2017-2020 Fred N. van Kempen.
+ *		Copyright 2021 Laci bá'
  */
 #ifndef EMU_86BOX_H
 # define EMU_86BOX_H
@@ -90,6 +91,7 @@ extern int	window_w, window_h,		/* (C) window size and */
 		vid_resize,			/* (C) allow resizing */
 		invert_display,			/* (C) invert the display */
 		suppress_overscan;		/* (C) suppress overscans */
+extern uint32_t	lang_id;	/* (C) language code identifier */
 extern int	scale;				/* (C) screen scale factor */
 extern int  dpi_scale;      /* (C) DPI scaling of the emulated screen */
 extern int	vid_api;			/* (C) video renderer */