Convert select sql to ecl

[SvenLehmann]

• [x] support simple selects
• [x] support selects with WHERE
• [x] support selects with LIKE
• [x] support selects with ORDER BY
• [x] support selects with GROUP BY
• [x] support selects with COUNT
• [x] support selects with COUNT and GROUP BY
• [x] support selects with LIMIT
• [x] support selects with JOIN
• [x] support selects with subselects in FROM (and all other select types for subselect)
• [x] support selects with subselects in WHERE - IN clause - (and all other select types for subselect)