New installer, New Structure, and Experimental Midstream Support.

Plenty of updates on this commit.

The installer now has a much more user-friendly interface
Kernel files are now pre-compiled and packed from .pkg.tar.xz (much faster installation)
Added experimental support for Midstream Kernel
Introducing arch-rock-installer as a new installation method.
Fixed bugs, and more.

kwankiu / archlinux-installer