Kernel Rework: Migrate kernel objects to KAutoObject

ldr: Simplify memory copy within LoadNro()

We can use the dedicated memory function for performing copies instead
of reading into a temporary buffer and then immediately writing it back
out to memory.

Eliminates a bit of heap memory churn.

fixup! common: intrusive_red_black_tree: Disable static_assert that will not evaluate as constant on MSVC.