Move scope parenting & class_scope from Compiler to Scope

This refactor fixes about a quarter of the test failures on master and (I
hope) will simplify some of the integration issues on the testing branch.
It is my best guess at The Right Thing To Do (or at least a step in that
direction) but I could be persuaded otherwise.

The basic idea is to take responsibility for maintaining scope hierarchy and
class_name -> class_scope mapping out of the compiler class and put it in the
scope class where it arguably belongs.  To maintain the semantics, class
scopes are all tracked by the "top level" scope, though this could be relaxed
if the nesting semantics were ever needed.

If this winds up being the right thing to do, related routines (e.g. newscope)
should be sorted out as well.

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