add screen detector in builder
add set method for scene change detection
refactor the setting of function pointer for simplification
Merge pull request #548 from volvet/add-set-scene-change-dection

add set method for scene change detection
Merge pull request #547 from volvet/add-build-for-scene-change-detect-for-desktop

add scene change detector for screen in builder
Add Unit Test Expand Picture
add static
 add maxbitrate parameter
rephrase blockzero function complexity and remove useless functions
Merge pull request #552 from dongzha/ExpandPic

Add Unit Test Expand Picture
Merge pull request #550 from sijchen/funcptr_refactor

[Encoder Refactor] Simplify the setting of function pointers
Merge pull request #554 from ruil2/encoder_update

 add maxbitrate parameter
Merge pull request #555 from huili2/remove_unused_func

rephrase blockzero function complexity and remove useless functions