fix(code): Correct PHP's notices and strict standards notices (refs #3108)
fix(package): Update dependencies (refs #3108)

Updated dependencies:
- dynacase-offline-xulruntimes-installer
- dynacase-offline-htmledit-installer
fix(postmigr): Add OFFLINE_postmigr_2.0.0 (refs #4447)

Change OFFLINEFOLDER's logical names from `offuser_XXX_<login>` to
`offuser_XXX_<userid>`.