* Indicate to the user when text is copied to the clipboard
- broadcast CopyToClipboard event to plugins after selection has been
copied, and InputReceived event after any input has been received.
- add new ClientToServerMsg InputReceived
- subscribe status-bar plugin to new events, modify second line after
CopyToClipboard, reset it on InputReceived.
* remove unnecessary InputReceived ClientToServerMsg
- use existing Actions instead to know that user input has been received
* make status bar text copied hint bold green
* cleanup
* cleanup
* cleanup