Revert "Import aPlib c sources by Joergen Ibsen"

This reverts commit bb7006136082c7aeb1d7a9b92f7b9b35d7ba8c02.
Revert "Import aPlib safe unpack"

This reverts commit 59b95e3520049b724651b9ec3a845f6a8c9dd56d.
Import aPlib 0.26
a2t.c: Update to latest aPlib
a2t.c: More load support for a2m
depack.c: Silence warnings for unused variable
a2t.c: WIP again
a2t.c. WIP again