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.

Userland/modload.cpp

@@ -0,0 +1,15 @@
+#include <serenity.h>
+#include <string.h>
+
+int main(int argc, char** argv)
+{
+    (void)argc;
+    (void)argv;
+    const char* path = "/TestModule.o";
+    int rc = module_load(path, strlen(path));
+    if (rc < 0) {
+        perror("module_load");
+        return 1;
+    }
+    return 0;
+}