kernel: Break thread-related AutoLockers into a separate header.

Including thread.h brings a massive array of things with it from
the kernel thread arch headers, team and thread definitions,
hash tables, linked lists, Referenceable, etc. that the vast majority
of AutoLock.h consumers neither want nor need.

So, put these in a separate header, and adjust all consumers of these
lockers to include the new file.

This change exposes the fact that a lot of files were inadvertently
making use of headers included indirectly through thread.h. Those
will be fixed in the next commit.

Fix building the m68k kernel

* Restructured the vm support code to align with the changes done to other archs.
* Not completely finished, but the kernel loads and panics. I had this sitting on the disk anyway.
* Only support 040 for now, 030 will need to be added back.
* This commit is dedicated to Jack Tramiel who passed away away last sunday:
http://www.forbes.com/sites/davidthier/2012/04/09/computer-legend-and-gaming-pioneer-jack-tramiel-dies-at-age-83/

Fix building the m68k kernel

* Restructured the vm support code to align with the changes done to other archs.
* Not completely finished, but the kernel loads and panics. I had this sitting on the disk anyway.
* Only support 040 for now, 030 will need to be added back.
* This commit is dedicated to Jack Tramiel who passed away away last sunday:
http://www.forbes.com/sites/davidthier/2012/04/09/computer-legend-and-gaming-pioneer-jack-tramiel-dies-at-age-83/