Revert "- drop YCP UI parts (fate#316195)"

This reverts commit b261dea7b7644047c056cbaa5b095d71c54aa940.
keep the old changelog, to not confuse OBS
- revert part of previous change: drop only UI parts, not Ruby API
- 3.0.2
ignores
remove empty files
remove obsoleted parts
Merge pull request #6 from jsuchome/master

- revert part of previous change: drop only UI parts, not Ruby API