Release history

0.2  10.02.2013 - first public release
0.3  20.02.2013 - added sound
                - fixed bugs in spawning and collision detection
0.4  17.03.2013 - various bug fixes
                - improved text editor speed
                - added remaining functionality from Spectrum version 3.4
0.5  30.03.2013 - fixed bugs in text editor
1.0  12.04.2013 - added routines to save games to disc
1.1  17.04.2013 - fixed critical bug in palette editor
                - fixed data errors in default "game"
                - added routine to load games from disc
1.2  29.06.2013 - fixed object initialisation routines in game engine
1.3  08.11.2013 - fixed sprite corruption at right edge of screen
                - return to BASIC at end of game
                - check for objects at next sprite position, not last position
                - sprites can now be spawned safely in main loop events
                - joystick 0/1 now selectable
1.4  13.10.2014 - stopped screen corruption in events editor
                - don't overwrite end marker when length of text message changes
                - fixed text buffer corruption when multiple messages are added in one go
