This change removes dependency on `alloc` from the loader, to archive this we removed the lz4 compression feature, use `xmas-elf` instead of `object` and don't use `panic-abort`.

This chage makes the loader slimmer and helps with upcoming refactoring

With the previous change `panic-abort` has now become obsolete

In preparation for the virtmem overhaul, this change moves the elf mapping functionality from the `kmm` crate to the loader.

This change allows managing an existing page table through the pmm interface

This change adds another method to the `Once` primitive that allows fallible closures

This change allows `Riscv64Sv39` to print its page table when displayed using the `Display` trait

This change removes the admittedly overengineered `Arch` trait that caused viral generics throughout all dependents with simple functions and consts

…array

…ical_memory_offset `

This change uses the `wavltree` lifecycle hooks to maintain an augmented version of the WAVLTree that supports more efficient gap search. This is inspired by a similar inspiration in the Zircon kernel and works by tracking the largest and smallest address of each nodes subtree, as well as the biggest gap in each subtree.

…of `root`/`root_mut` methods (#164)

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Implement the `find_spot` method that searches the augmented wavltree of mappings for a suitable gap given a `Layout`. The resulting spot will be randomized, but left-leaning.
Further method accepts an `entropy_bits` parameter that can be used to tune the sparseness of produced allocations. More consideration for this parameter can be found in the docs (docs/aslr.md)