Added portal clipping code to the 2012 project. Updated a file from the last merge that wasn't referencing the clipping engine as an object.

git-svn-id: http://mancubus.net/svn/hosted/eternity/branches/portal-branch@2678 86ba831e-150c-0410-ab35-e06eaae15ed9
Fixing up the lineOpening function a bit.

git-svn-id: http://mancubus.net/svn/hosted/eternity/branches/portal-branch@2679 86ba831e-150c-0410-ab35-e06eaae15ed9