Implement break and continue (#55)

* #52 Update chapter8 to align with chapter7

* #52 Update chapter8 to align with chapter7

* #52 Fix spacing

* #51 get started on break and continue

* #51 get started on break and continue

* #51 more on break and continue

* #51 more on break and continue

* #51 more on break and continue

* #51 more on break and continue

* #51 more on break and continue

* #51 more on break and continue

* break & continue scopes are made lazily, and merged into as discovered

Drop ContBreak.
Drop ScopeNode.addScope.
Add a simple mergeScopes.
Simplify Region.inProgress; drop from child classes, use in Region.
Add a ConstantNode.XCONTROL shortcut.

* Fix some regressions

* Error on dead code after break/continue

* A more robust dead-def check

* Fix for dead loop-back path

* Fix scope shadowing bug with continue/break

Turn on LAZY phis by default; fix minor golden test results

* Fix a case with both break & continue

* #51 more on break and continue

* #51 more on break and continue

* #51 more on break and continue

* #51 fix erroneous push of scope

* #51 fix import

* #51 update test expected results

* #51 Start Chapter8 writeup

* #51 Start Chapter8 writeup

* #51 _scope needs killing after continue

* Add graph evaluator (#56)

* #51 wip writeup

* #51 wip writeup

* #51 wip writeup

* #51 wip writeup

* #51 wip writeup

* #51 update code comments / add assertion

* #51 revert assertion

* #51 evaluate graph to verify test outcome

* #51 add code snippets

* #51 add examples

* Cleanup README

Comment for usefullness of true Loops.
Try to distiguish `PhiNode` as the programming construct from `phi` as the mathematically SSA notation.
Flow long lines.
Remove LAZY flag, set as `true`.  Fold up true tests.

* minor comment

* #51 Check _breakScope is not null when parsing break or continue to detect use outside of loop

* #51 in parseComparison we need to move the op= version above the op version, since at this time using <= and >= does not work since they are parsed as > and < with a preceeding = which causes an error

* #51 Update main README to link to chapter 8

* Remove useless test

---------

Co-authored-by: Cliff Click <cliffc@acm.org>
Co-authored-by: XmiliaH <45106915+XmiliaH@users.noreply.github.com>

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