- Unsafe use of reference picture PPS pointers.

  - Add macro for code changes.

- CVS to start with GDR

- catch std::bad_alloc explicitly
- remove catch-all handler

Software implementation for N0278:
1. Added VPS encoding in encoder
2. Add new project StreamMergeApp to N-to-1 bitstream merge
3. Changed decoder to support only decoding the specified layer stream

includes:
- rename flag HandleCraAsBlaFlag to HandleCraAsCvsStartFlag
- changes of NAL unit types (reduced number)
- profile_tier_level and general_constraint_info structures

- remove HighPrecision MV option
- fixes for statistics output
- removal of SVN header integration (fixes issue with Xcode)