hhast-migrate --php-arrays

Added hhast-migrate --php-arrays to replace PHP array literals with varray[] and darray[] literals. Empty array literals will be replaced with darray[].

This change should be safe at runtime, unless additional notices are enabled and a user error handler promotes the notices to errors.

If running on HHVM 4.43 or below, both [] and array() literals are supported; if running on HHVM 4.44 or above, only array() literals are supported as support for [] has been removed from the parser.

After this migration, consider refactoring any affected code to use vec, dict, keyset, tuples, or shapes instead.

DontAwaitInALoopLinter false positives

• foreach (await foo as $_) (AsyncGenerator instances) will not raise a lint error, unless it is nested inside another loop
• improved the pretty printer to better detect function boundaries

Support for . as a root

This refers to the project root - the same directory as the .hhconfig file. This can be useful for projects with multiple top-level source directories. If using . as a root, it is likely you will wish to exclude vendor/, and for performance, you might also want to exclude known-irrelevant directories such as node_modules/, if present.