Image loaders/builders++, TerraBuilder

- fixed pitch-related issues in image loaders/builders
- ozCore
  * String( double ) limited accuracy to fix 6665.999 etc.,
String::parseDouble()  accurate anyway
- ozFactory
  * ImageBuilder
    + buildDDS() -> convertToDDS()
    + createDDS() builds DDS from raw data
  * TerraBuilder
    + basic generating of heightmap and terrain texture for now (parameters
      cannot be set yet)