Added shell, minor fixes

Files:
	+install/remote.lua(GitHub installer)
	+sys/shell.lua(The whole "command,response" thing)

Edits:
	ftsetup.lua
		Now modifies ios.lua to add PCName as an ios variable

	install/disk.lua
		Reorganised file order slightly
		Added shell.lua retriever

	os/api/encrypt.lua
		Rewrote encryption algorithm to be a little clearer when debugging

	os/api/ios.lua
		printTitle() now inserts spaces as a function
		printTitle() now fills the entire first line
		Fixed printTitle() always returning cursor to 1,3

	sys/main.lua
		Moved PCName to ios.lua
		Infinitely runs shell.lua

Bugs:
	None known at commit.