change lib to dll.
Merge branch 'master' into ExtensionLibToDll
fixes pvz can't show.
Update All Extension h files.
Update cpp js lua template.
Update winrt and wp8 win32 project.
Update iOS and Mac project for adding ExtensionExport.h
remove unused code.
Merge pull request #5952 from chengstory/ExtensionLibToDll

Extension lib to dll