Fixes many WPCS errors and warnings
Also:
* Partly removes excessive php opening/closing tags.
* Uses printf for better readability in loop-templates/content-none.php.
* Adds understrap_kses_title() to escape post titles.
* Adds understrap_escape_the_archive_description() to escape the archive description.
* Fixes missing '__' after esc_html in author.php.
* Updates the phpcs.xml to reflect all the changes.
* Updates composer dependencies and scripts.
Removed all the unnecessary code to explicitly set the primary column's width. This is handled by Bootstrap 4's auto-layout. If we just provide it a column and its breakpoint, then as long as the sidebars have an explicit column width, the main will auto-fill.
IanDelMar
Gary Kealy
gillespieza
Alex Wright
Unknown
Vishal Deshpande
Holger Könemann
koenemann
Stef Kariotidis