utf8 bugfix; SGR/ANSI color code Update; Helper Libs updates

Subject is a pretty good "summary". The bug fix was for iterator printedChars on strings ending in multi-byte utf8. The SGR updates are renaming conceal -> hid and adding over and -fg, -bg with similar updates in python/cg.py and a new textAttr shorthand. The helper lib updates are a few mods/adds to cligen/sysUt and deprecation of the always questionable sysUt.findUO. RELEASE_NOTES.md has more details and git log max detail.