[KERNEL] Add ENOSYS to errno.h
[KERNEL] Add ino_t and mode_t types to types.h
[KERNEL] Add NULL definition to string.h
[KERNEL] Add strtok_r()
[KERNEL] Add strchr()
[KERNEL][VFS] Add new vfs message/response
[KERNEL][VFS] Add new fs operation + new mount() implementation
[KERNEL][VFS] Add generic implementation of mkdir() and lookup()
[KERNEL][VFS] Add tmpfs kernel implementation
[KERNEL][VFS] Add new vfs_init protocol