Capture warnings on queries, especially for common mistakes

ModeShape used to validate the columns used in queries, but that actually prevents users from selecting residual columns. For example, this query is now valid:

SELECT [myprop] FROM [nt:unstructured]

However, this means that some common mistakes are not caught. For example, one common typo is to use a period ('.') rather than a colon (':') in namespaced names:

SELECT [jcr.uuid] FROM [nt:base]

The above query is technically valid, but is probably a typo.

ModeShape should do as much as possible to help the user out. For example, we could change QueryResult to have a list of warnings, and we could include in those warnings things like:

1. columns that are assumed to be residual columns because they do not match property definitions on node types.
2. columns that don't match but are very similar to defined properties

(e.g., {{SELECT