Debugging any regular t and short names

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Debugging the any_regular_t type can be problematic if you don't know what the data type of the value stored in it is. To make it simpler for to view an any_regular_t in the debugger, release 1.0.41 contains a four character short name for the type which is stored at the top of the vtable.

The structure of an any_regular_t is a pair of doubles, the first word of the first double contains a pointer to a vtable.

any_regular_t
double double
vtable* pad (on 32 bit machines) data or data*

The first word of the vtable contains a version number on release builds (currently 1) and a short name (a four character constant) on debug builds.