2.0.1 Textpattern v4.7+ and PHP 7.4+ compatibility

Minor patch update for PHP 7.4+ of the previous refactored 2.0beta with txp 4.7+ compatibility.

See Readme instructions for details.

1.5.0-beta.1: Txp 4.6.2 and MySQL 5.7 compatibility

* TEXT columns can't have default values
* AUTOINCREMENT columns need omitting instead of sending empty '' strings