fixed #184: info window of end of demo level
#202 made the restart button work but bug: biobricks from previous session are kept
#202 fixed bug: biobricks from previous session are kept; but reactions & phenotypes are still broken
#202 restart button that is available at all times
#202 and #201: fixed restart aftermath
fixed post-respawn bug: bacterium went to previous target location
fixed restart button
Merge pull request #204 from CyberCRI/feature/endgame_screen

Feature/endgame screen: most of features and bugs have been dealt with