This commit adds support for the `t-for` whose syntax and usage is
similar to the syntax of the for..of loop in JS (and in fact it compiles
to a for..of loop). This looping construct supports looping on arbitrary
iterables and destructuring assignments, which would be difficult to
support in a backward compatible manner on the existing t-foreach
directive.
This commit adds a warning when an async hook
(onWillUpdateProps/onWillStart) takes longer than 3 seconds, as these
hooks block the rendering and patching of the application, it is rarely
desirable and often a sign of a deadlock. This warning will contain the
stack trace of the call to the hook to help in debugging.
Samuel Degueldre