More work on converting game to use Fleet.

A fleet properly moves and updates itself now.
The Status menu supports viewing multiple ships!
Finished up the Tavern conversion to using Fleet.
Converted the Shop menu to use Fleets&misc changes

The Shop menu does not fully function yet: a custom to_string function
that only leaves 1 decimal must be used. Perhaps utility.h already has
one.

The string 'blank' was removed because it's a legacy thing from 2010.
More #pragma ignores were removed.
A lot of type casting was added.