and reduce unnecessary dependencies and incredibuild wedging. Hopefully in
the long run this will reduce build time. Also cleaned up a lot of header
file usage to conform better to the coding standard.
reviewed by james and steve.
Ok, finally got this to a point where it doesn't break the build and I can check
in. llcommon can be built as a shared library (disabled but can be enabled with
cmake cache var LLCOMMON_LINK_SHARED.
reviewed by Mani on tuesday (I still need to get his suggested changes
re-reviewed)