nyx: add no box and 5 entries per line support

Icons that have `_nobox.bmp` in their name will make the grey background disappear.

Additionally a new option was added in Nyx Options called `Extended Boot Entries` that allows user to have a total of 10 entries showing up in Launch and More configs menus.

nyx/nyx_gui/config.h

@@ -42,7 +42,8 @@ typedef struct _hekate_config
 
 typedef struct _nyx_config
 {
-	u32 themecolor;
+	u32 theme_color;
+	u32 entries_5_columns;
 	u32 timeoff;
 	u32 home_screen;
 	u32 verification;