Set the iOS deployment target consistently

Set it on the project level, don't override it on the target level.

Set the deployment target to 6.0 everywhere.
Include inherited header search paths in all projects
solve green issue combined with EC and multi-packet input
update binary comparison test script
    add trace tag
Merge pull request #1151 from mstorsjo/unify-deployment-target

Set the iOS deployment target consistently
Merge pull request #1180 from huili2/dpb_green_issue_master

solve green issue combined with EC and multi-packet input
Merge pull request #1152 from mstorsjo/xcode-inherit-include-paths

Include inherited header search paths in all projects
Merge pull request #1171 from shihuade/ReleaseV2.2

update binary comparison test script
modify the logic for WME usage
modify trace output
Merge pull request #1183 from ruil2/trace_tag

    add trace tag
Merge pull request #1186 from huili2/diff_logic_WME_master

modify the logic for WME usage
fix reference frame update issue which will casue crash
Merge pull request #1188 from ruil2/trace_tag

fix reference frame update issue which will casue crash