[[ Unicodify ]] Fixed segfault on property inspection in the Application Browser
Revert "Remove libcore" - still needed by externals

This reverts commit 9e9ff5a72d9abd16414367408b88acd6757021ac.
Revpdfprinter-mobile relies on libcore
Add some missing files to the libcore project file
Get revbrowser and revpdfprinter building on OSX
Get revvideograbber building on OSX
Get OSX externals building again