Fix, Suppress or add comment to fix cppcheck warnings

git-svn-id: http://tortoisesvn.googlecode.com/svn/trunk/src/AsyncFramework@23820 4cfb86a4-2c7a-11df-bd14-c1e331e6ceac
constify methods.

git-svn-id: http://tortoisesvn.googlecode.com/svn/trunk/src/AsyncFramework@23826 4cfb86a4-2c7a-11df-bd14-c1e331e6ceac