as suggested in the PR it's best to make the setting configurable.
In order not to break existing installations, we default to keeping the
old behaviour, but in a later version of psalm, we might change the
default.
* Add failing test
* Add visitor to soup up classlike references
* Move a whole bunch of code into the visitor
* Move some methods back, move onto analysis stage
* Use the getAliases method everywhere
* Fix refs
* Fix more refs
* Fix some tests
* Fix more tests
* Fix include tests
* Shift config class finding to project checker and fix bugs
* Fix a few more tests
* transition test to new syntax
* Remove var_dump
* Delete a bunch of code and fix mutation test
* Remove unnecessary visitation
* Transition to better mocked out file provider, breaking some cached statement loading
* Use different scheme for naming anonymous classes
* Fix anonymous class issues
* Refactor file/statement loading
* Add specific property types
* Fix mapped property assignment
* Improve how we deal with traits
* Fix trait checking
* Pass Psalm checks
* Add multi-process support
* Delay console output until the end
* Remove PHP 7 syntax
* Update file storage with classes
* Fix scanning individual files and add reflection return types
* Always turn XDebug off
* Add quicker method of getting method mutations
* Queue return types for crawling
* Interpret all strings as possible classes once we see a `get_class` call
* Check invalid return types again
* Fix template namespacing issues
* Default to class-insensitive file names for includes
* Don’t overwrite existing issues data
* Add var docblocks for scanning
* Add null check
* Fix loading of external classes in templates
* Only try to populate class when we haven’t yet seen it’s not a class
* Fix trait property accessibility
* Only ever improve docblock param type
* Make param replacement more robust
* Fix static const missing inferred type
* Fix a few more tests
* Register constant definitions
* Fix trait aliasing
* Skip constant type tests for now
* Fix linting issues
* Make sure caching is off for tests
* Remove unnecessary return
* Use emulative parser if on PHP 5.6
* Cache parser for faster first-time parse
* Fix constant resolution when scanning classes
* Remove test that’s beyond a practical scope
* Add back --diff support
* Add --help for --threads
* Remove unused vars
