Concept of native code stepper, version 0.4

Hi!

I pushed much more advanced version of stepper. Changes:

- bugs are fixed, works more or less reliably
- stepping commands are step-over, step-into and continue, they are
bound to keyboard.
- shows lisp source as you step
- can step out of the function where stepping begun
- can switch into stepping mode from calls to (break), (cerror) and
trace with break
- also can step function explicitly with native-code-stepper:! function

Note that stepper _does_not_ recreate a function behind a scene as
Lispworks IDE stepper does. So no dependency on compilation context.
Also it is inherently integrated with (and based upon) other debugging
facilities of IDE, in contrast to Lispworks IDE stepper.

http://code.google.com/p/def-symbol-readmacro/source/browse/experiments/hack-debugger/native-code-stepper.lisp

The file is self-sufficient. It only requires 6.1 32-bit Windows
Lispworks IDE (e.g. Personal Edition). Just compile, load and run
tests (demos).

Also, the stepper mostly bases on general features of CL debugger:
(break) and "find source". So this code can be taken as a base for
implementing debugger for any other CL implementation.

It is still not a tool, just proof of concept. E.g. it can't step closures.

WBR, Budden

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