Changed c function name suffixes to f, d and l.
Removed table pointer aliases.
Made a few function parameterless templates (it seems to help GDC inline them)
Added some (commented out) code that avoids using raw_rfft1d to stdapi
Made stdapi.d, pfft.d and test.d use table pointers explicitly.

After removing table pointer aliases, *Table direct api members
are structs and not pointers to structs.