core: Make a glyph shape handle Optional, for ie whitespace

core: Convert two unused doc comments to normal comments

This fixes Nightly warnings

avm2: Implement XML.prependChild

avm2: Remove unnecessary '&mut self' from Object methods

fix(deps): update rust dependencies

chore: Update translations from Crowdin

tests: Add a test for using Shared Objects without a root movie

chore: Update translations from Crowdin

avm1: Set target clip to None if target is an undefined object

SetTarget currently sets the target clip to the base clip if the
target passed to tellTarget() is an undefined object. This causes
goto's to run on the base clip in Ruffle, when Adobe Flash Player
does not run the goto's at all.

Fixes ruffle-rs#12389 and ruffle-rs#12390

avm2: Preserve attribute flag when filling lazy multiname with QName

Fixes ruffle-rs#12570