Fixes#3571. Credit to @ayumihamsaki. Thanks to @petehalverson for his PR testing system, this is the first PR I'm merging after testing it with that system.
Add option to horizontally align the loader indicator in the center and option to change the size (only small size available for now) through the JavaScript API. These abilities were already available through CSS, this commit makes them available through JS as well.
This change allows both settings models and custom settings controllers to be registered in one definition by preventing overwriting of the provided `url` when present. This enables the use case of extending the base \System\Controllers\Settings controller to implement custom functionality on your settings controller while retaining the majority of the default functionality enabled through the use of a SettingsModel.
Fixes#2714, #2774.
Plugin Management UX Improvements
The plugin management screen has been improved to allow managing the status of plugins (updates disabled/enabled, plugin enabled/disabled) on the overview page and allow bulk management of plugins as well. Additionally, the Reset Plugin Data action has been added to the bulk action menu; this is essentially the same as calling `php artisan plugin:refresh Author.Plugin`, which reverses all the migrations for that plugin then reapplies them; effectively reseting the plugin's database data. Due to the destructive nature of this action it has been limited to only be available to Super Users and only when the site is in debug mode.
Thanks to @Teranode for his assistance on this.
Fixes: https://github.com/octobercms/october/issues/1927. Related: https://github.com/laravel/framework/issues/17508. Issue occurs when database configuration related to full support for the utf8mb4 charset is incorrect; MySQL > 5.7 & MariaDB > 10.2 doesn't have this issue because they default to the correct configuration values; this fix solves the issue for older versions of MySQL and MariaDB without requiring database server configuration changes.
The root cause of the issue with the utf8mb4 encoding is that both InnoDB and MyISAM have too low of an index key prefix limit (767 bytes and 1000 bytes respectively) to properly store 255 4-byte characters; which would take 1024 bytes. See the docs on InnoDB limitations: https://dev.mysql.com/doc/refman/5.7/en/innodb-restrictions.html
In MySQL >= 5.7 & MariaDB >= 10.2 this limit has been bumped to 3076 bytes by the changing of the default value of the `innodb_large_prefix` configuration property (introduced in MySQL 5.5) to true; which is what bumps up the limit. In order to manually set that property to true on earlier versions, `innodb_file_format` must be set to `BARRACUDA` and `row_format` must be `DYNAMIC` or `COMPRESSED`. See http://mechanics.flite.com/blog/2014/07/29/using-innodb-large-prefix-to-avoid-error-1071/ for more information.
This change fixes the issue by changing the default string length to 191 (total of 764 bytes, within the older size limit) when the MySQL database config is detected to be using the utf8mb4 charset.
