Add ban-duplicate-column-assignments rule + parser improvements

Added

• linter: add ban-duplicate-column-assignments rule (#1263, #1262)
• ide: add code action to switch between comment types (#1271)
• ide: add code action Rewrite integer as (#1266)
• ide: fold where clauses (#1265)

Changed

• parser: refactor names/name refs into specific nodes (#1272, #1260, #1259, #1258, #1257, #1256, #1254, #1253)

Fixed

• linter: support all line endings (#1270, #1269, #1268, #1267)
• ide: fix goto def for composite type subfield (#1255)