Kernel: Implement very simple kernel module loading

It's now possible to load a .o file into the kernel via a syscall.
The kernel will perform all the necessary ELF relocations, and then
call the "module_init" symbol in the loaded module.

Kernel/Process.h

@@ -220,6 +220,8 @@ public:
     int sys$realpath(const char* pathname, char*, size_t);
     ssize_t sys$getrandom(void*, size_t, unsigned int);
     int sys$setkeymap(char* map, char* shift_map, char* alt_map);
+    int sys$module_load(const char* path, size_t path_length);
+    int sys$module_unload(const char* name, size_t name_length);
 
     static void initialize();