There is an edge case fixed where the whole would be freed and this would make use of a nullptr.
Additionally, remove usage of reserved names for vars and add comments on how it works.
- Allow reuse of unused sections that fit exactly to selected allocation size. Decreases fragmentation dramatically.
- Always allocate and align mapped memory to selected alignment. Avoids having fragmented unused maps that are not aligned.
- Use a static alignment based on BPMP and generally average cache line size. Boosts performance when MMU is used.
