Some structure.sql fixes

1. Duplicate table `edited_message` removed
2. In MySQL 5.7 with default mode `STRICT_TRANS_TABLES` you can see error: `SQL Error 1101: BLOB/TEXT/GEOMETRY/JSON column '' can't have a default value`. To avoid this I removed all default values from TEXT columns.

Tested and works on MySQL 5.7.

Adventures with Monolog, ready for the real world 👌

Check log file for correct contents.

Add test helper to modify static properties.
Move external log file test into main log test class.

Quick updates

# Conflicts:
#	src/DB.php
#	structure.sql

API 2.1

# Conflicts:
#	src/DB.php
#	structure.sql

A few suggestions

Fix curl exception handling.

chosen_inline_result table and make utf8mb4 default

Conflict