[v1.0] Database should support raw statements for multiple methods

[marktopper]

The Database component should support raw statements for multiple methods, example the where-method.

We use the where-method like this:

$db->table('table')->where('column', 'operator', 'value')->get();

However it needs support for adding raw statements like this:

$db->table('table')->whereRaw("strftime('%Y', `created_at`) = ?", ['2016'])->get();
$db->table('table')->where($db->raw("(SELECT count(id) FROM user_groups WHERE users.id = user_groups.user_id"), '>', 1)->get();

That is my idea on how this should work.

The functions that might require usage of raw statements:

• where
• select
• orderBy
• groupBy
• join