April Changes and Updates

A few useful little tweaks and changes. The most significant is the introduction of a number of settings and internal code modifications to allow for the use of multiple monitors.

2020-04:

    gnocl::pixBuf
        o commands screenshot, windshow and widgetshot now work correctly.
    gnocl::screenShot
        o new command
    gnocl::text
        o -onInsertText this GtkTextBuffer callback binding now supports %w, the widgetId of the textview assoicated with the buffer.
    gnocl::image
        o cget -image now returns path/name of the image file displayed.
    gnocl::eventBox
        o new option -onDoubleClick
    gnocl::layout
        o new option -background
    gnocl::screen
        o "screens" command renamed to nMonitors, now works properly.
        o "geometry" command returns a list of the geometries of all system monitors.
    gnocl::window
        o "centre" and "center" commands now accept new option -monitor, range 0 - n.
        o -resizeMode now works, options: parent, queue, immediate.