Merging r6506 through r6510 from branch releases/1.8 to trunk

Note those were mostly backport, so trunk already had most changes.
Also we've not merged all from 1.8 branch, will need another merge (backports tend to cause lots of ugly conflicts, so have to split this a bit)


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6515 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/Irrlicht-gcc.cbp

@@ -835,6 +835,7 @@
 		<Unit filename="COpenGLCoreFeature.h" />
 		<Unit filename="COpenGLCoreRenderTarget.h" />
 		<Unit filename="COpenGLCoreTexture.h" />
+		<Unit filename="COpenGLCommon.h" />
 		<Unit filename="COpenGLDriver.cpp" />
 		<Unit filename="COpenGLDriver.h" />
 		<Unit filename="COpenGLExtensionHandler.cpp" />

source/Irrlicht/Irrlicht10.0.vcxproj

@@ -1151,7 +1151,6 @@
     <ClInclude Include="CZBuffer.h" />
     <ClInclude Include="ITriangleRenderer.h" />
     <ClInclude Include="IZBuffer.h" />
-    <ClInclude Include="resource.h" />
     <ClInclude Include="S2DVertex.h" />
     <ClInclude Include="SB3DStructs.h" />
     <ClInclude Include="CColorConverter.h" />

source/Irrlicht/Irrlicht10.0.vcxproj.filters

@@ -1263,7 +1263,6 @@
     <ClInclude Include="..\..\include\IAnimatedMeshMD3.h">
       <Filter>include\scene</Filter>
     </ClInclude>
-    <ClInclude Include="resource.h" />
     <ClInclude Include="CSceneLoaderIrr.h">
       <Filter>Irrlicht\scene\loaders</Filter>
     </ClInclude>