The Events Calendar - Filter Bar 5.5.9

* Tweak - General improvements to the plugin code in order to make it more accessible [120758]
* Tweak - Improved accessibility by removing duplicate IDs [120758]
* Tweak - Grouped checkboxes together with a common aria label [120758]
* Tweak - Added descriptive text to anchor tags [120758]
* Tweak - Removed empty anchor tag from checkboxes markup [120758]
* Tweak - Changed Filter Sections to be tabbed and open/closed with the keyboard [120758]
* Tweak - Changing focus states of elements that did not have them [120758]
* Tweak - Improved the design for the horizontal view bar [120758]
* Tweak - Improved dropdown arrows positioning to their correct place [120758]
* Tweak - Made the submit button visible in order to make it accessible [120758]
* Tweak - Added a notice on the "Enable live refresh" setting, letting people know that if they use it it will affect accessibility [120758]
* Tweak - Improved the JS for Filter Reset button that had an ID change [120758]
* Language - 4 new strings added, 34 updated, 0 fuzzied, and 0 obsoleted

* Feature - Add check and enforce PHP 5.6 as the minimum version [116282]
* Feature - Add system to check plugin versions to inform you to update and prevent site breaking errors [116841]
* Tweak - Added filters: `tribe_not_php_version_names`
* Deprecated - The function `TribeEventsFilterViewsLoad()` and constant `REQUIRED_TEC_VERSION` along with `initAddon()` method has been deprecated in `Tribe__Events__Filterbar__View` in favor of Plugin Dependency Checking system
* Language - 7 new strings added, 20 updated, 0 fuzzied, and 1 obsoleted

* Fix - Ensure that translations are loaded before admin error messages are shown