GStreamer.m: Update help text for post 32-Bit OSX era.

No 32-Bit OSX anymore. Minimum is now 10.6 Snow Leopard. 64-Bit Windows
now supports delay loading as well, so that installation is now
optional. Disable Homebrew instructions for now, as Homebrew build
unavailable atm.
Psychtoolbox: Bump version number to 3.0.11 - Retire 32-Bit OSX.

Bump version number to v3.0.11, set release date to 3rd July 2013.
Modify Download/Update/SetupPsychtoolbox and
PsychtoolboxPostInstallroutine to:

a) Disable all support for 32-Bit OSX, ie. 32-Bit Matlab and 32-Bit
Octave on OSX.
b) Disable all support for OSX versions older than 10.6 Snow Leopard.

-> The actual mex files will be removed in a separate commit.
Delete all mex files for 32-Bit Matlab on OSX.
Delete dead makefiles for moglcore and moalcore.

We only need the ones for Matlab on Windows. The other ones have been
merged into the master makefiles for the different os'es.
Delete old .java backup files for GetCharJava.

Also remove obsolete 1.4.2-9 GetCharJava.class for pre R2007a Matlab's
and other cleanup.
Add PsychJavaSwingCleanup to try to avoid Java outOfMemory exceptions.

PsychJavaSwingCleanup.m, as adapted from the solution in forum msg
#16043 is supposed to solve the infamous java.lang.outOfMemory
exceptions (java heap space) by some trickery to reinitialize the buggy
and leaky Java swing repaintmanager.

For now we call it from within sca(), so it gets some decent chance to
run at the end of an experiment session involving Screen().
PsychImaging: Call PsychJavaSwingCleanup via onscreen window close hook.

Set up a callback into PsychJavaSwingCleanup() in the onscreen window
close hook.
This way, closing any onscreen window that was opened via
PsychImaging('OpenWindow', …); will trigger the Java cleanup function.

Not sure if this is a good idea.