rules 8.x-3.0-unstable7

Another development snapshot of Rules 3.x:

• We implemented a temporary storage system in the UI similar to Views.
• Several UI improvements to make the Rules UI work as a prototype.
• Rules expressions con now be checked for integrity to validate their configuration.
• Developed a new data fetcher service that works with Typed Data to resolve arbitrary property paths like node.uid.entity.name.value.
• Implemented a new Twig-style token replacement system as a typed data service. Example: "{{node.title}} has been updated" or "The year is {{ date | format_date('custom', 'Y') }}"

Full changes since 8.x-3.0-unstable6:

• #2632516: Rename RulesState and its interface to ExecutionState.
• #2632582 by fago: Make use of property path terminology and path separators for selecting data and move it to the TypedData namespace.
• #2632582 by fago: Make current code and tests work with fetching property paths.
• #2632582: Added typed data test skeletion.
• #2632582: Fixed MissingDataException.
• #2636180: Added UI to create actions in a rule
• Only allow short array syntax in Rules
• #2637102: Implemented the data selector / direct input mode switcher button in the UI for conditions
• Added browser test base class for shorter and more readable test code
• #2637102: Implemented the data selector / direct input mode switcher in the action UI
• Improved page title when editing reaction rules and rules components
• #2632636: Moved forms and controllers out of Entity namespace
• #2636408: Added UI for editing actions and conditions in a rule
• Fixed context name in UserHasRole condition
• Fixed comment and moved class references in string to ::class
• Implemented default values in context forms
• #2632582 by fago: Fix coding style issues for the data fetcher.
• #2632582: Added tests for DataFetcher (WIP).
• #2632582: Completed data fetcher test and improved the data fetcher exceptions thrown.
• #2648918 by fago: Add initial, untested PlaceholderResolver class.
• #2648918: Move placeholder resolver to work as a service based on Typed Data instead of the Context API.
• #2648918 by fago: Add basic PlaceholderResolverTest and make PlaceholderResolver actually work.
• #2648918 by fago: Extend test coverage for token placeholder resolver.
• #2648918 by fago: Extract an interface for the PlaceholderResolver service.
• #2648918 by fago: Implement adding bubbleable metadata for the placeholder resolving and data fetching systems.
• Fixed PHP notices in the UI and improved handling of consition plugins without category
• #2649500: Switch UI logic to use a temp-store
• #2653516: Add UI test cases for temporary storage and locking
• Removed TypedDataManagerTrait, use the identical form Drupal core instead
• #2650440 by fago: Add initial architecture and prototyped plugins for data filters.
• #2650440 by fago: Add test coverage for data filters and make them work.
• #2650440 by fago: Fix DataFilterInterface documentation.
• #2654852 by pfrenssen: Fix waiting for webserver to start when testing on Travis.
• #2654892 by fago: Allow using data filters in placeholder tokens.
• Allow data filters to add their bubbleable metadata.
• #2648352: Implemented an integrity check on configuration time with an execution metadata state
• Disabled HHVM testing, made Drupal core clone faster by using Github, added caching for composer PHPCS dependencies
• Also use travis_retry for composer downloads in case there are errors
• #2650372: Implemented meta data definition fetcher and use that for integrity checks
• #2650448 by fago: Add support for global context.
• #2650448 by fago: Add support for global context in the execution metadata state.
• Fixing some typos in the DataFetcherInterface docs.
• #2650448 by fago: Fix RulesIntegrationTestBase to work with global context.
• Fixed 'definition' typo in variable names
• #2650366: Moved DataFetcher to a standalone Typed Data service
• Added test case for metadata fetching with unknown properties in lists
• #2650448 by fago: Fix ExecutionState::hasVariable() to support global context.
• #2653588 by fago: Improve event classes to allow for defined properties.
• #2655604: Added integrity check violations for missing plugins, invalid provided variable names, data selecotr restrictions
• #2650426 by fago: Move to twig-style token replacement syntax.
• #2655026 by fago: Add a format_date data filter.
• #2655026 by fago: Add bubbleable metadata test coverage for applying data filters.
• #2539700 by a.milkovsky, stevepurkiss: Port "init" system event to D8
• #2632564 by fago: Make use of the new placeholder token replacement system.
• #2650426 by fago: Convert placeholder separater from : to . for compatibility with Twig syntax.
• #2637048 by Cogax, Sentei: After saving a component, I should be redirected to the component edit screen
• Renamed addVariable() to setVariable() in execution states because it overrides existing variables
• #2648284 by vasi1186: A service container rebuild is required when events are configured.
• #2654816 by KiranJoshi, Sentei, markie: Add cancel button to undo temporary changes to a rule.
• #2659026 by fago: Add a UI embed testing module.
• #2660204: Fixed false integrity check violations on provided variables when they are used
• #2658960 by klausi: Create the loop action expression plugin
• #2655604: Added integrity checks for data type matching