Working on a port to x86_64, switching from GRUB to Limine #48
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…ry; improve debug output on stack traces
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In this PR I‘m porting the whole system from x86 to x86_64, switching from GRUB2 to Limine in the process. This finally also brings UEFI support and vastly improves compatibility with real hardware. The additional "loader" that was previously responsible for loading the kernel binary to higher memory is removed since it is no longer required. The physical memory manager is rewritten since the old one was not suitable for 64bit address space. I am ditching support for x86 with this since I don‘t see the point in supporting a legacy architecture in a fun project. Last things to do before this goes to master is fixing SMP support and a few minor TODOs.