./configure and autoconf

After trying to install SHACrypt via Portage on a new Gentoo VM, I've noticed that the Makefile looks patched together, as if I had just taken examples off the internet and put them in a file. That's why the following changes will occur soon:

• The Makefile will be handled by GNU automake and GNU autoconfig
• SHACrypt CLI and SHACrypt GUI will be on two separate branches of the repository
• The test suite will be split up into multiple bash scripts and testing will be done via automake

The end result is a much easier build system that works universally.