Fixed|Builder|OS X: Signing binaries on Mavericks

OS X 10.9 requires that *all* binaries are signed, not just the applications
themselves.

This commit calls codesign on bundled shared libraries, Qt frameworks,
Qt plugins, and other binaries. Also, a number of symbolic links in the
frameworks are recreated since they seem to have gone missing (bug in
macdeployqt?).
Fixed|Builder|OS X: Further fix for signing the bundled Python framework
Builder|OS X: Exclude compiled Python files from signing

The launcher is written in Python, and the compiled versions of the
Python modules may be updated when the user runs the app. Therefore
they cannot be included in the signed files.