- Rename members of WPScalingParam to conform to guidelines
- Avoid casts from const to non-const types
- Modify getWpScaling function to handle case where the reference
  index is negative (see #733)
- Add helper function isWeighted to determine whether weighting
  parameters are present for any colour component
- Fix some indentation issues

   - Move wrap around offset from SPS to PPS.
   - Disable wrap around for any reference pictures that require RPR scaling.

JVET-Q0806 Geo related adoptions (JVET-Q0059, JVET-Q0077, JVET-Q0123, JVET-Q0188, JVET-Q0242_GEO, JVET-Q0309, JVET-Q0365 and JVET-Q0370)

   - Fix encoder segmentation fault when checking IBC reference.

   - Extend "RefPicIsScaled" logic to cover corner cases where the scale factor is 1:1, but the scaling window offsets are not aligned.
   - Specify scaling window offsets in units of SubWidthC and SubHeightC pixels.