Bug 1063: Complete Uri impl. and adoption throughout GlueGen

- Uri:
  - Add error correction (fix) of path at ctor
    in case a a contained Uri is requested from an opaque one.
    The latter might come from URI/URL and is not properly encoded!
    See Uri.PARSE_HINT_FIX_PATH

  - Simplify conversion methods:
    - valueOf(URI/URL): Re-encode only if not opaque
    - getNativeFilePath() -> toFile()

  - Move IOUtil Uri related constants to class Uri

  - Add DEBUG and DEBUG_SHOWFIX

- Complete adoption of URI -> Uri changes
  - IOUtil, JarUtil and TempJarCache still holds some
    left over deprecated methods, which will be removed
    after officially starting 2.3.0 (JOGL dependencies)

  - Otherwise not URI utilization left

- Tests
  - Cleaned ip TestUri01 and TestUri03Resolving

  - TestUri03Resolving also tests URL -> Uri,
    and hence mentioned Uri.PARSE_HINT_FIX_PATH