add UT for sim-SVC switch
reformat cpp files for next release
fix bug in set option return value
reformat cpp files for unit tests
Only use pthread_setname_np on Android >= 9 (2.3)

Older versions of Android don't have this function.
Merge pull request #1442 from mstorsjo/android-pthread-setname

Only use pthread_setname_np on Android >= 9 (2.3)
Merge pull request #1439 from sijchen/for_format

[Reformat] format cpp files for next release
Merge pull request #1440 from shihuade/APIUTV1.4

fix bug in set option return value
Merge pull request #1443 from dongzha/AddUTSwitch

add UT for sim-SVC layer switch
    fix a small range of slice idx
Merge pull request #1446 from sijchen/for_format

[Encoder] fix a small range of slice idx