add EC frame/slice copy.
Modify ARM32 Neon code for Expand Chroma Picture, when UVWidth%16==8.
overwriteactivesps
Merge pull request #709 from huili2/ec_mb_check

add EC frame/slice copy.
rename some varialbes
  add usagetype parameter in encoder unit test to test screen content
turn off TestHorizontalSearch_SSE41 unit test becasue of random issues
Merge pull request #713 from licaiguo/overwriteactivesps

overwriteactivesps
Merge pull request #712 from ruil2/enc_rename_1

rename some varialbes
Merge pull request #714 from ruil2/enc_setting

  add usagetype parameter in encoder unit test to test screen content
give accurate align information for mc copy functions
this can improve the performance for target like javascript
specify accurate align information for intrapred c functions
Minor optimzation on iRun for cavlc
Merge pull request #717 from licaiguo/cavlc

remove redundant init for iRun in CAVLC
Merge pull request #716 from licaiguo/ForJS

Specify accurate align information for mc copy and intrapred c functions
modify sequence to fix bug for LTR feedback info
add DPB management if frame loss happens
Merge pull request #718 from huili2/LTR_feedback_info

modify sequence to fix bug for LTR feedback info
Merge pull request #720 from huili2/ec_add_ref_mgt

add DPB management if frame loss happens
Merge pull request #719 from dongzha/MC

Modify ARM32 Neon code for Expand Chroma Picture, when UVWidth%16==8.