Wrong line/col info for MapEntryExpressions

Whenever there's a map entry, a named parameter, etc, a MapEntryExpression is used, but the line / col of MapEntryExpression is just surrounding the column, instead of the whole key + colon + value.

Another problem with MEE is that the value goes up to the next comma or closing square bracket (including all potential whitespace), instead of just stopping at the end of the expression or constant.