specialized-arrays: performed some cleanup.

specialized-arrays: performed some cleanup.

Specifically,
    •   Created >c-array to be replacement for >T-array.
    •   Created cast-array to be generic replacement for all T-array-cast words.
    •   Created c-array@ to be generic replacement for T-array@ words.
    •   Replaced usages of <T-array> with T <c-array>
    •   Replaced usages of <direct-T-array> with T <c-direct-array>
    •   Replaced usages of >T-array with T >c-array
    •   Replaced usages of T-array-cast with T cast-array
    •   Replaced usages of malloc-T-array with T malloc-array.
    •   Removed malloc-T-array.
    •   Removed T-array-cast.
    •   Removed T-array@.
    •   Removed >T-array.

I also added (but didn't change any code to use):
    •   T c-array-type, returns T-array
    •   T c-array?, returns T-array?
    •   c-array{ T ... }, returns T-array{ ... }

Bootstraps just find on Mac OS X.  Also `load-all test-all` works for me.