Allow for reserved ranges to be plopped. Ie, selectively
call Reserve when plopping bytes instead of always doing it.

When the memory space is asked for nearby ranges,
it should return a range.

Let a plugin tell us about where to plop a dollop.
This change includes a

1. utils namespace with a function to calculate
the worst case instruction size.
2. Dollop_t type that can be used to describe
and pass around a dollop.

Partial nonce-code -- should be silent without IRDB relocs added.  Also refactored byte_map into memory_space.

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