Checks for auCDtect and SoX are done earlier

This alleviates the issue where the top banner would display
indicating script success only to have the script exit
because of missing programs.

Cygwin users also get a message detailing how to install the
Windows version of auCDtect for use on their system.

Fixed bug where auCDtect aborts would leave temporary WAV
files.  This happened because the BASH subshell would be a
different PID from what was expected via $$ of the parent
shell.  Removing temporary files based off of $$ yielded
an incorrect PID
Small fix for SoX existing test[7~
Fixed github certificate issue using 'wget'

Explicitly disabled validating the server's certificate
since most users will not have ca-certificates installed
in their environment.

Small changes to instructions on installing auCDtect
Implemented auCDtect.exe into Cygwin!

Now, users can install auCDtect.exe and redoflacs
will run the Windowx command, integrating it within
the redoflacs interface they know and love
Update to Version 0.18.3_cygwin