Updated CCleaner.ps1, minor formatting fixes

-Small formatting fix to add a newline after Powershell exception
message.
-Formatting fix to force date/time to always be bolded and black in log
window.
-Updated CCleaner script to force a wait until the application closes
before continuing. This necessitates an architecture check - launching
CCleaner.exe on a 64-bit machine will make it open CCleaner64.exe and
immediately close. Since I don't have the PID for this new process, I
now launch the 64-bit executable directly on a 64-bit machine.