Set the specified color (0-511) to the given rgb-value.

     Set the specified color to the given rgb component
     values. This function is easier to use than set_color(),
     but it is slower.

     Retrieve the rgb-value of the specified color.

     Load one or more 16-color palette-blocks at once.
     'pal_num' is the index of the first block (0-31)
     to load, and 'nb_pal' the number of block.
     This function can be used to load palette defined
     using #defpal or included with #incpal directive.

     Exactly the same function has load_palette(),
     but this function offers direct access to sprite
     palette-blocks. Sprite palette-blocks are
     standard block number 16 to 31, but with this function
     you can simply access them with indexes 0 to 15.
     This function and set_bgpal() function make sprite
     and character palette-blocks manipulation easier;
     with them you don't have to know the real block indexes.
     Without the third arguments, the function loads
     only one block.

     Same function as set_sprpal() but for character
     palette-blocks.