modify the encoder interface

modify the encoder interface to support the bit rate setting
modify the type and line length
reformat and correct the static_cast
reformatting and remove the unnecessary case
complete encoder interface of FRAME RATE setting

add WelsEncoderAdjustFrameRate and add parameter check
Merge branch 'master' of https://github.com/cisco/openh264
Merge branch 'master' of https://github.com/cisco/openh264

Conflicts:
	codec/encoder/core/inc/extern.h
	codec/encoder/core/src/encoder_ext.cpp
	codec/encoder/plus/src/welsEncoderExt.cpp
reformat
reformat
Merge branch 'master' of https://github.com/sijchen/openh264 into base
Merge branch 'base' of https://github.com/sijchen/openh264 into base