extended automatic tape playing modes
added some of the more important recent changes (see git log for details)
added option for window icon file to run-time special edition support
added program config file support for run-time special edition support
replaced stop/play buttons in game panel with save/load buttons
updated ChangeLog file
fixed (swapped) editor zoom directions for '-' and '+' (keypad) keys
updated ChangeLog file
added support for gadget-like pressable menu buttons on main screen
added manually edited non-preset audio volume values to select list
changed mouse cursor on title screens not being always invisible
fixed using 'background.TOOLBOX', which was simply ignored before
fixed using 'PageUp' and 'PageDown' keys for element list in editor
changed editor key shortcut for undo/redo to 'u' and 'Shift-u'
added key pad '-', '+' and '0' keys to zoom function in level editor
added 1%, 2% and 5% to volume controls for sound and music settings
increased number of undo/redo steps in level editor from 10 to 64
changed unused playfield from default to empty after loading level
fixed bug with editor border element not adjusted after resizing level
added zoom functionality for playfield drawing area to level editor