Real hardware

Problem: Unable to boot on real hardware

Solution: Fixes for some of the drivers

Changes introduced by this pull request:

• Require manual resolution
• Use 28-bit LBA commands, with PIO
• Rewrite keyboard driver
• Disable USB drivers

Drawbacks:

• Loss of USB support, video resolution must be manually set

TODOs:

• Fix the USB drivers
• Fix DMA support
• Feature detection for 48-bit LBA support and DMA support