PublishPress Future Pro

* ADDED: Add new filter for filtering the list of post types supported by the plugin: publishpressfuture_supported_post_types, #677; * ADDED: Add new filter for choosing to hide or not the Future Action in the post editors: publishpressfuture_hide_metabox, #69; * ADDED: Add new filter for filtering the post metakeys in the post model: publishpressfuture_action_meta_key, #69; * ADDED: Add new method `medataExists` to the `PublishPressFutureFrameworkWordPressModelsPostModel` class; * ADDED: Add support to a hash in the the post meta `pp_future_metadata_hash`, to identify if the future action's post meta has changed or was scheduled by metadata (fully availale only on PRO); * ADDED: Add metadata support for the future action data, allowing to schedule actions based on metadata (support for ACF, Pods, and other plugins), #69; * ADDED: Add metadata mapping for allowing integrating with 3rd party plugins, #69; * ADDED: Add a setting for hiding the Future Action metabox on the post edit screen and keeping the future actions enabled, #69; * ADDED: New Gutenberg Block for displaying the future action date, #171; * ADDED: Add new action `publishpressfuturepro_process_metadata` for triggering the future actions scheduling based on metadata, #69; * CHANGED: Deprecated the filter `postexpirator_unset_post_types` in favor of the new filter `publishpressfuture_supported_post_types`, allowing not only remove, but add new post types to the list of supported post types, #677; * CHANGED: The list of post types in the settings page now also shows the non-public post types that are not built in on WordPress, #677; * CHANGED: Remove the X and Facebook icons from the footer in the admin pages, #667; * CHANGED: Updated the URLs on the plugin's footer, #667; * CHANGED: Minor change in the description of the setting that controls the activation/deactivation future action for the post type; * CHANGED: The metadata `_expiration-date-status` now can be specified as `1` or `'1'` and not only `'saved'`, #69; * CHANGED: The action `publishpress_future/run_workflow` is now depreacated in favor of `publishpressfuture_run_workflow`; * CHANGED: When metadata support is enabled, a future action enabled is recognized by the presence of the date metadata field, ignoring the status field, #69; * CHANGED: Added support for other date formats in the date metadata field, not only unix timestamp, #69; * CHANGED: Minor changes to the layout of some settings pages; * CHANGED: Change the default settings tab to "Post Types" instead of "General"; * CHANGED: Change the links and items in the footer on the plugin's admin pages, #667; * FIXED: Fix language files for ES, IT, FR, #665; * FIXED: Fix error when a term does not exists, #675; * FIXED: Add new interface for NoticeFacade: NoticeInterface; * FIXED: Fatal error: Delcarations of PostStatusToCustomStatus::getLabel() must be compatible with the interface, #674; * REMOVED: Remove the legacy action `postExpiratorExpire`. This action will not trigger the future actions anymore; * REMOVED: Remove the legacy action `publishpressfuture_expire`. This action will not trigger the future actions anymore;