Increase I2C clock speed to 400k to get much more usable scan rate.
Update build options for what I actually use, and save code space.

The smaller code space (12.5k rather than 21k) seems to make the bootloader
  jump faster too.
The BenBlazak firmware which is only 8k gets into programming mode MUCH
  faster... Not sure why yet.
Add dvorak layout with swappable hands, and support for password macros.