Merge changes I339d0389,I2fa1e87a,If79fa5ae,Icb1a8cb8,Ic76de4a4, ... into nextgenv2

* changes:
  Add missing CONFIG_DAALA_EC declaration.
  Add API for writing trees using a CDF.
  Add macro to build a simple cdf table.
  Use Daala entropy coder to code trees.
  Silence clang-format code review warning.
  Use Daala entropy coder to code bits.
  Clear existing format issue in the codebase
  Add Daala entropy coder.