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.

README_BOOTLOGO.md

@@ -4,14 +4,16 @@ The bootlogo can be any size with a maximum of 720 x 1280.
 
 When it's smaller than 720 x 1280, it is automatically centered and the background takes the color of the first pixel.
 
-When saving a landscape bootlogo, it should be rotated 90 degrees counterclockwise.
+The process is to create a landscape bootlogo and then rotate it 90 degrees counterclockwise.
 
 Lastly, the supported format is 32-bit (ARGB) BMP. Classic 24-bit (RGB) BMPs are not supported for performance reasons.
 
 
 ## How to configure
 
-If a boot entry specifies a custom logo path (`logopath=`), this is one will be loaded.
+If a boot entry specifies a custom logo path (`logopath=`), this one will be loaded.
 
 If the above is not found or the format is not correct, it will try to load `bootloader/bootlogo.bmp`.
 If this is not found, the default hekate logo will be used.
+
+(`bootloader/bootlogo.bmp` is basically like a global bootlogo.)