Fix stdint.h include that broke the build for VC9 and below.
Merge pull request #265 from jonnenauha/vc9-fix

Fix stdint.h include that broke the build for VC9 and below.
OgreImporter: Started cleanup and refactoring. Aim is to get this into a shape that its easy to read and understand before I start making any new features.
OgreImporter: Continue cleanup.