MxDSBuffer::ParseChunk to 100%

[disinvite]

Not a full beta match because the beta does not call MxDSStreamingAction::FUN_100cd2d0. It does almost the same thing but like this:

if (m_unk0x30->GetDuration() != -1) {
    m_unk0x30->SetLoopCount(m_unk0x30->GetLoopCount() - 1);
    m_unk0x30->SetUnknowna8toDuration()
}

Filled in some other beta addrs and fixed member set order in MxDSBuffer and MxDSChunk constructors.

[foxtacles]

I think we should test for != SUCCESS on both function calls here so it's clearer