Trying to get ModelCriteria::addSelectQuery(): working.

Found several issues:

• primary table is not set, leading to queries without FROM (addressed here)
• columns from ModelCriteria::select() are not resolved` (addressed here)
• subquery column name replacement in outer query does not work
• subquery columns are not quoted in outer query

This addresses subquery column name replacement in outer query.

Problem example:

$numberOfBooksQuery = BookQuery::create()
->addAsColumn('NumberOfBooks', 'COUNT(Book.Id)')
->select(['NumberOfBooks', 'AuthorId'])
->groupBy('Book.AuthorId');

AuthorQuery::create()
->addSelectQuery($numberOfBooksQuery, 'numberOfBooks', false)
->where('Author.Id = numberOfBooks.AuthorId')     // note that 'AuthorId' is an alias from the subquery
->withColumn('numberOfBooks.NumberOfBooks', 'NumberOfBooks');

leads to query

SELECT ... 
FROM author, (
  SELECT
    COUNT(book.id) AS NumberOfBooks,
    book.author_id AS "AuthorId" 
  FROM book
  GROUP BY book.author_id
) AS numberOfBooks 
WHERE author.id = numberOfBooks.author_id;     -- column author_id does not exist on subquery 

The error is quite simple: When replacing the column literal from a subquery, the column map was also set, which causes the column to be treated as a column belonging to the outer table. Not setting the column map resolves the issue.

Note that the whole column name replacement is very smelly. Look at what happens with the currentAlias class variable if you want to get a whiff. I initially cleaned this up, but realistically, a large commit like this is not going to get reviewed properly, so boiling it down seems like the best option. During refactoring, I found that tests for name replacement were scattered across three files. That cleanup I kept, because it is probably helpful for others. It is in its own commit, should you want to review it separately.

Oh, I have cleaned up two other minor, yet pretty stunning semantic mistakes that I found:

• two properties were defined in the child class, but accessed in the parent class via $this, when $this generally does not have them. Pretty sad that Pstan was just silenced, when it correctly complained about it.
• The constructor of BaseModelCriteria did not call the parent constructor, and instead copied its code.

I'll highlight them in the review, so it does not confuse anyone.
Btw. I think theese mistakes highlight a larger issue with the Criteria classes, where it is not clear from their name what they do (what`s a "Critera", particularly in contrast to a "Criterion", and why does it create sql code?), and where extension hierarchy was abused to decompose the classes, leading to arbitrary logical splits between them. This has apparently and understandably left people confused what goes where, including me.