[oc] vga-lcd core update

[Richard Herveille <richard@asics.ws>]

Hi guys,

1:
I've changed something in the internal counter-library.
This makes the core easier to synthesize, some tools (especially 
DC-compiler) seemed to have problems interpreting the previous version.

Anyway, these changes did not affect the functionality of the core.

2:
I added 32bpp support

3:
I updated the documentation.
-fixed some typos
-added 32bpp mode
-added 'bandwidth issues' section.

Richard

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