Set parent and foreground process ids on macOS

This allows sending signals to work again.  Correct macos keytab so
Ctrl+C and Ctrl+V work.  Add warning to show sending signals
require foreground process id to be set.

data/keyboard-layouts/macos.keytab

@@ -12,12 +12,12 @@ keyboard "macOS"
 # ~/Library/Application Support/konsole/
 
 key A+Ctrl : "\x01"     # goto start of line
-#key C+Ctrl : "\x03"  # Does not work - Cmd+C is copy
+key C+Ctrl : "\x03"     # interrupt
 key D+Ctrl : "\x04"     # logout "exit"
 key E+Ctrl : "\x05"     # goto end of line
 key L+Ctrl : "\x0C"     # clear terminal screen
 key U+Ctrl : "\x15"     # clear current line
-#key V+Ctrl : "\x16"    # Cmd+V is paste
+key V+Ctrl : "\x16"     #
 key W+Ctrl : "\x17"     # erase the word preceding to the cursor position
 #key Z+Ctrl : "\x1a"
 

src/ProcessInfo.cpp

@@ -793,6 +793,10 @@ private:
                 const QString deviceNumber = QString::fromUtf8(devname(((&kInfoProc->kp_eproc)->e_tdev), S_IFCHR));
                 const QString fullDeviceName = QStringLiteral("/dev/")
                                                + deviceNumber.rightJustified(3, QLatin1Char('0'));
+
+                setParentPid(kInfoProc->kp_eproc.e_ppid);
+                setForegroundPid(kInfoProc->kp_eproc.e_pgid);
+
                 delete [] kInfoProc;
 
                 const QByteArray deviceName = fullDeviceName.toLatin1();

src/session/Session.cpp

@@ -790,6 +790,8 @@ void Session::sendSignal(int signal)
 
     if (ok) {
         ::kill(pid, signal);
+    } else {
+        qWarning()<<"foreground process id not set, unable to send signal "<<signal;
     }
 }