Added font CharWidth() support.

git-svn-id: http://maxmods.googlecode.com/svn/trunk@1629 b77917fb-863c-0410-9a43-030a88dac9d3
Added key filter support.
Set tabs size based on pixel size - mostly.

git-svn-id: http://maxmods.googlecode.com/svn/trunk@1630 b77917fb-863c-0410-9a43-030a88dac9d3