Add a note about libedit weirdness to README.md.
Mention `TAR` in README.md.
Make the current exception identifier configurable.
Ensure that we don't treat the current exception identifier as a namespace/type.
Remove -c, instead treat all non-option args as commands.
Make sure disabling colors actually takes effect.
Support Ctrl-C via hooking SIGINT.

We have to bypass System.Console entirely because it screws up
libreadline for whatever reason.

Fixes #1.
Verified signal values on FreeBSD.
Make sure the SIGINT handler delegate isn't GC'd.
Ensure `config defaults` applies the defaults after setting them.
Make Ctrl-C a little chattier.

Also make sure that `cfg set EnableControlC ...` takes effect
immediately after being issued.
Attempt to make SDB more Windows-friendly.

This needs some actual testing.
Add a guard to CommandLine.ControlCHandler to avoid recursion.
Fall back to Mono.Terminal.LineEditor when libreadline is unavailable.
Add a --norc option.

When using SDB for tests or the like, execution of commands
in ~/.sdb.rc is probably not wanted, so this option disables
that.
Add an SDB_CFG environment variable.
Ensure all access to Debugger.Session is serialized.
Make Debugger.Session private.

Less room for threading errors.
Simplify some code in CustomLogger.
Use libc printf for printing.

Because apparently Console.WriteLine messes up the history
of libreadline. Bloody hell.