Implement VESA

[wang103]

Implement VESA for better screen resolution etc.

[wang103]

http://www.rohitab.com/discuss/topic/35103-switch-between-real-mode-and-protected-mode/
http://en.wikipedia.org/wiki/VESA_BIOS_Extensions
http://wiki.osdev.org/Getting_VBE_Mode_Info

To switch to real mode: http://wiki.osdev.org/Real_Mode
To switch to protected mode: http://wiki.osdev.org/Protected_Mode