Enables the special alpha-channel editing mode.
Enables the special alpha-channel editing mode, which is used for drawing
alpha channels over the top of an existing 32-bit RGB sprite, to turn it
into an RGBA format image. After calling this function, you can set the
drawing mode to DRAW_MODE_TRANS and then write draw color values (0-255)
onto a 32-bit image. This will leave the color values unchanged, but
alter the alpha to whatever values you are writing. After enabling this
mode you can also use draw_trans_sprite() to superimpose an 8-bit alpha
mask over the top of an existing 32-bit sprite.
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