refator for API test--prepareEncDecParam and EncodeOneFrame
Merge pull request #1398 from shihuade/APIUT_V1

refator for API test--prepareEncDecParam and EncodeOneFrame
add API only for decode parser for HW decoding support
Merge pull request #1399 from huili2/ParseOnlyAPI

add API only for decode parser
    add checking of frame rate and temporal layer setting for encoder input param
Reviewed at https://rbcommons.com/s/OpenH264/r/836/
Merge pull request #1403 from sijchen/fr_setting_fix1

[Encoder] Add checking of frame rate and temporal layer setting