Update trunk tests: add textureRenderStates.cpp to tests_vc8.proj and tests.cbp; fix reversed logic in irrCoreEqual.cpp (the test wasn't being run); re-base the trunk tests/main.cpp on 1.5 tests/main.cpp, with the addition of those tests only available on the trunk.

Tested on Windows with MSVC 2005 and Code::Blocks, with a local trunk re-application of the terrainSceneNode.cpp change in SVN 2039 (which will get merged down separately).  I'll re-test on Linux as soon as I've committed this.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@2040 dfc29bdd-3216-0410-991c-e03cc46cb475