HLS encoder & decoder cleanup

This MR contains the following changes and is based on top MR !30 (merged) changes:

Encoder cleanup:

• Removal of timestamp addition functionality from encoder. To be re-implemented in the HLS Utility tool.

Decoder cleanup:

• Removal of timestamp based decoding and feature set based decoding from decoder. To be re-implemented in the HLS Utility tool.

Addition of HLS Config (see hls_encoder.cfg) for encoder:

• Addition of HLS config file in encoder which supports following HLS functionalities:
  • EncodingStartTimestamp : Inserts a timestamp indicating start time of encoder in the beginning of bitstream.
  • EncodingEndTimestamp : Inserts a timestamp indicating end time of encoder in the end of bitstream.
  • SegmentMetadataInterval : Specifies the number of IntraPeriods contained in a segment.
  • EncodedBlockSizes : Enables the encoding of each segment's payload packet sizes.
  • MAE : Denotes whether to pass Maximum absolute error in bitstream or not.
  • PRD : Not implemented yet.
  • SNR : Not implemented yet.