Fully implement KLD and preloading.

- seperate unload for preloaded linker objects.
- Don't build a kernel object if running as an a.out kernel.
- extract the real kernel name rather than hardwiring "kernel" for kldstat.
  (sysctl kern.bootfile getst the full name via bootinfo)
- use real addresses on the kernel "module" rather than fictitious ones.
- preloaded module support
- search module path for file modules.
- symbols are checked to see if they are in the right containing file
  before using their indexes into string tables.  This is to help ddb
  since it only supplies a pointer to an opaque symbol and there is no
  telling which file/object/module/whatever it came from.

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