This makes sure that every possible leftover of any console messages that contained \r are correctly removed when using a category based show message call.
* Alphabetically sorted includes.
* Updated copyright and license text to match across all files.
* Removed pragma once define in header files in lieu of ifdef guards.
* Fixes#3205.
* Follow up to 801d3ed.
* Resolved some string literals requiring a space.
* Redefine my_bool for MySQL 8.0 or later.
Thanks to @bentheexo and @secretdataz!
