Add reflection in plugin on android.
Refactor the implementation of plugin protocols on android.
issue #2224 : Modify the implementation of plugin twitter & weibo on android for the new framework of plugin.
issue #2224 : Modify the implementation of plugin alipay & nd91.
issue #2224 : Modify the implementation of plugin admob.
issue #2224 : Modify the implementation of plugin flurry & umeng.
issue #2224 : Use variable argument functions in the implementation of reflection.
issue #2224 : Implement reflection in plugin on iOS.
issue #2224 : Modify the implementation of plugin flurry & umeng on iOS for the new framework.
Merge branch 'ForReflection' into develop

Conflicts:
	plugin/protocols/platform/ios/PluginUtilsIOS.mm
Merge pull request #2680 from natural-law/develop

Refactor the framework of plugin