Eslintrc updates

"no-fallthrough": "error", Is already in eslintrc:recommended

"no-unreachable-loop": "warn", Very useful. Similar to sonarjs/no-one-iteration-loop Unclear to me if these are identical.

"sonarjs/no-collection-size-mischeck": "warn", Useful

"sonarjs/no-same-line-conditional": "info", Linting according to project convention

"sonarjs/no-unused-collection": "warn" Very useful