kernel: various changes.

+ kernel: replace sk-hello test executable with a test initramfs
+ panic: start implementing a proper kernel panic screen
+ lib: added a new string.h library for string manipulation.
+ kernel: replace all the strlen implementations with the strlen() function

kernel/src/fs/vfs.h

@@ -1,28 +0,0 @@
-#pragma once
-
-// btw fuck sun
-
-#include <stdint.h>
-
-#define VNODE_TYPE_FILE 0
-#define VNODE_TYPE_DIR 1
-#define VNODE_TYPE_DEV 2
-
-typedef struct __vnode {
-  char name[128];
-  int type;
-
-  struct __vnode *children;
-  struct __vnode *next;
-  struct __vnode *parent;
-
-  void (*write)(void *buffer, uint64_t off, uint64_t size);
-  void (*read)(void *buffer, uint64_t off, uint64_t size);
-} vnode;
-
-typedef struct __vfs_mount {
-  struct vfs_node
-      *mount_point; // The directory in the main VFS where this is mounted
-  struct vfs_node *mounted_root; // The root node of the mounted filesystem
-  struct vfs_mount *next;        // Pointer to next mount point
-} vfs_mount;