fix building error

further clean up

further fix

correct hrd param class,fix OlsHrdParams

first version of HRD.(VPS does not include the ols dementional), need to add another OLS demention)

Added syntax element display_elemental_periods_minus1 to the picture
timing SEI message
Check that the frame field information SEI message signals the same
value as the picture timing SEI message

- compile fix for clang/macOS
- remove unused parameters
- fixes for the software manual

Signalling of CPB timing parameters for sub-layers in DU-based HRD
operations
Remove pt_max_sub_layers_minus1 and use corresponding syntax element in
BP SEI
Make parsing of BP, PT and DUI SEI independent from SPS

- create own files for HRD classes
- rename HRD to HRDParameters
- create HRD class that can hold all HRD related parameters as base for encoder/decoder specific implementations