Move enabling dbus sendText/runCommand to 'Configure Konsole' dialog

Instead of using the cmake defination
REMOVE_SENDTEXT_RUNCOMMAND_DBUS_METHODS, have it in Konsole's main
'Configure Konsole' settings under new Security tab.
In 2016, there were security concerns about allowing dbus methods
sendText and runCommand to be public. Both Konsole and yakuake used
this cmake variable to hide these methods. Allowing this in the GUI
should make it more visible. The default is enabled as it has
always been.