Also upgrade the file picker filters with the new extensions found
in the orginal file picker code of Singularity.
Also improve AIFilePicker a bit: added hasFilename() and now
deleting the statemachine automatically by default: it's no longer
needed to call deleteMe from the callback.
Fixed by updating indra/cmake/WebKitLibPlugin.cmake with
version from imprudence.
This commit also contains removal of execute permissions
of source files and configure files, sorry...