Patched everything for aarch64, aside from scheduler, add more linker

points to aarch64 ld, add aarch64 heap, init, page tables and usermode,
make hhdm_offset a global atomic, aarch64 uses semihosting for output,
add generic PageTable type, add a function that creates and maps pages,
use allow to remove warnings, add a bufwriter so kernel panic always
works

.gitignore

@@ -1,4 +1,5 @@
 /limine
+/.zed
 /edk2-ovmf
 *.iso
 *.hdd