Fix generating widget-application item

Fix generating widget-application item

This commit is based on:
 - https://review.tizen.org/gerrit/71796

The way it is changed is:
 - widget information is gathered in manifest_x structure and
   backend data because data that is created by StepParse is
   inserted into database directly according to past changes
   (even we add widget information to generated manifest
   it is not read).
 - icon path is full path for widget-application (same as for
   ui-application) to handle icon backup, copying and pkgmgr
   expectations.
 - <size> is changed to <support-size> defined in manifest.xsd.in
   in pkgmgr-info repository.

Requires:
 - https://review.tizen.org/gerrit/71798
 - https://review.tizen.org/gerrit/72573

Change-Id: I2c980ae205f29fb70928aba58d8d3458d88a9c90