This reverts commit 0f85939bc5.
Embarrassingly, my benchmark code was broken. move16 very much does
help, both in VRAM<->TT RAM and TT RAM<->TT RAM copying.
- every malloc is now aligned on 16 bytes
- no need for the hidden pointers
- ct60_vmalloc() is called only once, the rest is handled
by dlmalloc (SV XBIOS' vmalloc is pretty fragile)