[install] update metadata with version and date
[install] split README and INSTALL
more elaborate handling of persistent mode after exiting menu: only if alt key is not down
[install] fix bad project name
bring back the largest icon size
add a CREDITS file
use square brackets to show the workspace number below the icon
[install] do not set bad version if tag is missing
add a LICENSE file, add copyright info to main source file
avoid flickering thumbnails when re-selecting same window
more fine-grained minimize/restore choices in menu for multiple selections
don't enter persistent mode upon showing quick help
add tooltips to a couple of settings, shorten a couple of descriptions
[install] add uninstall target, make sure to remove symlink without erasing pointed-to directory
minor overview of menu structure
simplify the sorting of windows in global-focus-order mode
do not allow thumbnail to scale larger than actual size