Chrome V8 engine for Android apps

The JavaScript engine is changed from WebKit to Chrome V8, so as to support 64-bit Android apps. This change affects the mobile apps running on Android. The developer and the end user do not need to do anything for this change after upgrading to PowerServer 2019.

Due to this change, the Appeon Workspace version must be exactly the same as the PowerServer server version, otherwise, this error may occur: "Appeon client library (build xxxx.xx) is incompatible with the PowerServer (build xxxx.xx)".