Summary of changes:
- Update video ram controller to fix an earlier design error and add a noise killer
- Reduce Config Clk from 20MHz to 10MHz
- Resync with IceBoot 0.4 and update version string
- Increase speed of config from FLASH 4x using buffered SPI writes
Note: Reducing the config clock to 10MHz has got rid of the sporadic CDone Not Set errors I was seeing on my BlackIce II board.