Convert LF to CR when pasting into the terminal.

Previously, copying and pasting multiple lines from, say, Notepad, into
jediterm didn't work.  winpty turned each LF into Ctrl-Return rather than
Return.

src-terminal/com/jediterm/terminal/ui/TerminalPanel.java

@@ -452,7 +452,10 @@ protected void pasteSelection() {
     }
 
     try {
-      myTerminalStarter.sendString(selection);
+      // When we read the clipboard contents on Windows, Java replaces any
+      // instances of CRLF with LF.  A terminal enter/return key is encoded as
+      // CR, though, not LF.  (Ctrl-Return generates LF.)  Convert LF to CR.
+      myTerminalStarter.sendString(selection.replace('\n', '\r'));
     } catch (RuntimeException e) {
       LOG.info(e);
     }