Test search conditions

[Slamdunk]

• Test each search condition against a real dovecot service
• Test UTF-8 characters
• Map exact imap_search manual condition keys
• Implement BCC and CC conditions
• Add RawExpression condition to allow arbitrary user criteria
• Handle Unknown criterion imap errors
• Escape spaces in conditions
• Escape double-quotes in conditions WARNING unable to escape spaces and double-quotes together; the default behaviour is to escape spaces only, which are more common. A dedicated test has been marked as incomplete.
• Test OR condition WARNING unable to have a server that implements OR condition. A dedicated test has been marked as incomplete.

BC Breaks

1. Ddeboer\Imap\Search\Date\{After => Since}
2. Ddeboer\Imap\Search\Email\{FromAddress => From}
3. Double-quotes are not escaped anymore (they have never been functioning anyway)