py/objstr: Support tuples and start/end args in startswith and endswith.

This change allows tuples to be passed as the prefix/suffix argument to the
`str.startswith()` and `str.endswith()` methods.  The methods will return
`True` if the string starts/ends with any of the prefixes/suffixes in the
tuple.

Also adds full support for the `start` and `end` arguments to both methods
for compatibility with CPython.

Tests have been updated for the new behaviour.

Signed-off-by: Glenn Moloney <glenn.moloney@gmail.com>

0 files changed, 0 insertions, 0 deletions