- Mm-rewrite:

- Mm-rewrite:
 * Get rid of a hack-based heap allocation in FreeLdr, which makes real data interleaved with temporary data, all that unfreeable and unmanageable.
 * Introduce new APIs MmHeapAlloc / MmHeapFree to alloc/free memory from a pre-allocated heap.
 * Add BGET (public domain heap implementation), hook it up to the MmHeapAlloc / MmHeapFree APIs.
 * MmAllocateMemory still is a backward-compatibility API, will be removed soon.
- Change most of allocations to the heap-based routines, add frees where necessary (I must admit Brian already used MmFreeMemory in a lot of places, so I just had to change those to the corresponding MmHeapFree API).
- Remove unneeded and wrong IDT filling, which was commented out.
- Temporary disable caching support, because it needs a standalone place to keep its data in. For compatibility's sake it's better to leave it when WinLdr is more mature.

svn path=/branches/winldr/; revision=29518