allow custom data on buttons
enable the install button if the upgrade is available with a message
show Home button and parameterize button locations
rename method to re-position upgrade buttons
use button parameters
add home and install buttons
disable mouse
disable mouse
shorten aliveUpgrades import name
isolate play_image clearing and drawing to the play state
first version of home info screen
reposition install button and description text
print the upgrade result after install
use a more readable font for button hotkeys
fix upgrade unavailable tip
some design ideas