[x265] A patch for CRF of x265

[idxa at sina.com]

Hi,

I have written a patch for adding CRF into x265,including the following features，
 
1. add a parameter of "--crf" to the command line,
2. modify the running branches of rateControlStart, using "if(isAbr)" instead of "switch (cfg->param.rc.rateControlMode)", for the logic of classifying the combination of multiple ratecontrol methods is very complex, it is not only based on rateControlMode, so porting x264's way looks feasible,
3. add crf method into x265.
 
And it looks a better way to add a function like x265_parameters_validate() to deal with parameters validation, and add a function like RateControl::init() to do more initialization work instead of  RateControl::RateControl();
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