Iterables++ & cleanup, GLTexture--, ALSource-- ...

- ozCore
  * iterables
    + iXXX removed except for iCopy, iMove and iEquals
    + added iAdd, iTake, iInclude, iExclude
  * arrays
    + added citer() for initialiser lists
    + removed aFind and aFindLast
  * EnumMap copies InitialiserList, doesn't allocate memory any more
- ozEngine
  * removed GLTexture, identicon moved to GL
  * removed ALBuffer, ALSource, ALStreamingSource since not used anywhere and
    don't fit in