Adding Puredata Extended 0.43 (stable)

Installs Puredata Extended v0.43. Does not currently uninstall.
The app has 0555 permissions on some of the files and the cask cannot
simply 'rm' the files since we don't have write access to them. Need
some further guidance on how to handle this.
Merge pull request #4587 from vitorgalvao/huslage-puredata

Adding Puredata Extended 0.43 (stable)