allow_deprecated_* session settings

These settings are available in system.settings and are autogenerated from source.

​

allow_deprecated_database_ordinary

Allow to create databases with deprecated Ordinary engine

​

allow_deprecated_error_prone_window_functions

Allow usage of deprecated error prone window functions (neighbor, runningAccumulate, runningDifferenceStartingWithFirstValue, runningDifference)

​

allow_deprecated_syntax_for_merge_tree

Allow to create *MergeTree tables with deprecated engine definition syntax