[aur-general] Merge request: appinventor

[Gordin]

Please remove appinventor-setup [1] and merge the votes to appinventor [2].
I adopted appinventor-setup and renamed it to appinventor as the
"-setup" really doesn't make any sense... Even the "source" tar.gz
just contains the appinventor binaries and an empty appinventor-setup
folder.

[1] https://aur.archlinux.org/packages.php?ID=43678
[2] https://aur.archlinux.org/packages.php?ID=54765