JVET-AC0353: Implementation of nnpfc_baseFlag
Detail:
- Add nnpfc_baseFlag
- Add the control for that flag in the cfg file & update the manual doc
- Implement checking at encoder side to ensure that when sending an update, the base filter is already present
- Implement detection at decoder whether the given base filter is a new or a repetition filter.
- Implement checking at decoder side to ensure that when receiving an update filter, the base filter has been received earlier / already present.