* Remove gSystemHeap and use _buffersSegmentEnd instead, make buffer alignments explicit for gcc
* ALIGNEDn -> ALIGNED(n), reposition alignment attribute for PreNmiBuff
* Correct positioning of ALIGNED for filter data in audio/lib/data.c
* Add ALIGNED to TypenameMacros
* ALIGNED(4) on same line for PreNmiBuff
* Revert audio load.c change, to be submitted separately