Fix icon copying

Fix icon copying

Icons element are receiving full path in StepParse from now
for both wgt and tpk backend and all modes.

Steps:
 - StepCreateIcons
 - StepBackupIcons
 - StepRecoverIcons
 - StepRemoveIcons
handles icon files only outside package directory (those in: $HOME/.applications/icons/*)
Icons within application directories are copied together with whole package directory (StepCopy)
and are not managed by those steps.

To handle copying icons within package directory new steps are introduced:
 - StepWgtPatchIcons (copy to $package/shared/res/ from widget content directory)
 - StepTpkPatchIcons (copy to $package/shared/res/ if they are in different location, e.g. preload apps)

Following changes needs to be submitted together:
 - https://review.tizen.org/gerrit/57258 (wgt-backend)
 - https://review.tizen.org/gerrit/57257 (app-installers)
 - https://review.tizen.org/gerrit/57259 (tpk-backend)

Verify by:
 $ /usr/bin/tpk-backend-ut/smoke_test --gtest_filter=SmokeTest.UpdateMode_Tpk
 $ /usr/bin/tpk-backend-ut/smoke_test --gtest_filter=SmokeTest.InstallationMode_Tpk
 $ /usr/bin/tpk-backend-ut/smoke_test --gtest_filter=SmokeTest.DeltaMode_Tpk
 $ /usr/bin/wgt-backend-ut/smoke_test --gtest_filter=SmokeTest.InstallationMode
 $ /usr/bin/wgt-backend-ut/smoke_test --gtest_filter=SmokeTest.UpdateMode
 $ /usr/bin/wgt-backend-ut/smoke_test --gtest_filter=SmokeTest.RDSMode
 $ /usr/bin/wgt-backend-ut/smoke_test --gtest_filter=SmokeTest.DeltaMode
 $ /usr/bin/wgt-backend-ut/smoke_test --gtest_filter=SmokeTest.UpdateMode_Rollback
 $ /usr/bin/wgt-backend-ut/smoke_test --gtest_filter=SmokeTest.InstallationMode_Rollback

Change-Id: Ib4d9c86f76b4308eb4258cef1882cc8fe79965fb