1) NET_Sleep() no longer watches for input, Sys_Sleep() added for waiting
on input.
2) Added "CtrlHandler" for trapping Ctrl-C and other quit methods not
handled by signals on windows
3) Added history support
4) Added tab completion
5) Removed automatic cursor/scroll adjustment (too problematic)
6) Enable mousewheel scrolling
7) Stop using the InputBuffer for editing
This seems to work pretty well now, but I jumped the gun on a previous
commit message by saying you can scroll now without locking up your server.
That was only true up until the point that a server tried to print to
the console, at that point it will hang until you release the scroll bar :(
It may be possible to get around this by using a seperate thread for
console output, but that's a whole new can of worms.
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