Broken version being committed, so will can commit his broken version so we can both finish our hacking without dealing with repo conflicts.

Updated to write zipr.map for machine/human reading of the 'map' between instructions and their final location.

1. Add support for plugins to call certain
Zipr_t functions. This meant making a class
that is Zipr_t and then converting the actual
implementation to a subclass (ZiprImpl_t). The
Zipr_t goes in the zipr_sdk.

2. Ask all plugins about each instruction
and determine whether there are any takers
for plopping.

3. When plopping an instruction, consider
whether or not a plugin asked to do the plopping.
If so, let it do the work.

updated zipr to use add_segment instead of move_segheaders for corredtness and size effeciency for CGC

That's a mouthful: No replop is the default and
the -r option will make it so that dollops _are_ replopped.

that start/end on the same byte are actually
1-byte big. Update tests to confirm this.

calling RemoveFreeRange().

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