engine: vgui: add EnableTextInput to the API

engine/client/vgui/vgui_draw.c

@@ -63,7 +63,7 @@ static struct
 		VGUI_CursorSelect,
 		VGUI_GetColor,
 		VGUI_IsInGame,
-		NULL,
+		Key_EnableTextInput,
 		VGUI_GetMousePos,
 		VGUI_UtfProcessChar,
 		Platform_GetClipboardText,

engine/vgui_api.h

@@ -180,7 +180,7 @@ typedef struct  vguiapi_s
 	void	(*CursorSelect)( VGUI_DefaultCursor cursor );
 	byte		(*GetColor)( int i, int j );
 	qboolean	(*IsInGame)( void );
-	void	(*Unused)( void );
+	void	(*EnableTextInput)( qboolean enable, qboolean force );
 	void	(*GetCursorPos)( int *x, int *y );
 	int		(*ProcessUtfChar)( int ch );
 	int		(*GetClipboardText)( char *buffer, size_t bufferSize );