[archiso2dual] Refactor the code

Notable changes:
* -R option added. Used to specify a file with a list of files or directories
     to remove from root-image.sqfs. This option only works with -T full.
     A list of files/directories that will be removed is printed.
* -T purge_us profile removed, now is managed via -R option.

* Profiles looks now:
  -T <profile>     Type of target image (work is done on root-image.sqfs):
         basic:    join both images, no changes in root-image
         split:    'basic' + split out usr/share/ and lib/modules/ from root-image
         full:     'split' + remove specified directories (with -R) from root-image

* Code is now a bit small made by some refactions.

Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@yahoo.com.ar>

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