Compilation changes

Few compile time attempts to speed things up

Swap include guards for pramga once
Change compile options in the cmakeLists for source
generate a pch

small tweaks

Engine/source/gfx/gfxTextureObject.h

@@ -19,25 +19,20 @@
 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 // IN THE SOFTWARE.
 //-----------------------------------------------------------------------------
+#pragma once 
+#pragma once 
 
 #ifndef _GFXTEXTUREOBJECT_H_
 #define _GFXTEXTUREOBJECT_H_
-
-#ifndef _REFBASE_H_
 #include "core/util/refBase.h"
-#endif
-#ifndef _MPOINT3_H_
+
 #include "math/mPoint3.h"
-#endif
-#ifndef _GFXENUMS_H_
+
 #include "gfx/gfxEnums.h"
-#endif
-#ifndef _GFXTEXTUREPROFILE_H_
+
 #include "gfx/gfxTextureProfile.h"
-#endif
-#ifndef _GFXRESOURCE_H_
+
 #include "gfx/gfxResource.h"
-#endif
 
 class Point2I;
 class GFXDevice;