Notes about creating custom block sets
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The bitmap used has to be 140x80 at 24 bit BMP file.
Each block is 20x20 pixels.

a) The first 6 blocks are used to draw the 'curtain' that falls when a level ends.
The first of them is used for the left block, the 2nd for the middle blocks, and
the 3rd for the right block. The same goes for the 4th, 5th and 6th

b) The 7th block of the first line is unused

c) The 3 lines of blocks below are the 3 block sets each theme can have
You can draw these blocks as you prefer but if you want the users to like
them, don't change the base colors.
So the first one has to be RED, the second YELLOW, etc. You can still make it
darker or whatever, just make sure it's RED or YELLOW etc.

IMPORTANT NOTE: As you can see in the BLOCKS.BMP, the third block is PINK.
DO NOT use the brightest pink to draw this block (RGB 255, 0, 255). This color
is used by the game and will make the areas with this color to be invisible in the
'next block' area of the game. Use the color RGB 250, 5, 250 instead, which is Ok
and nobody can tell the difference.
