This commit un-deprecates DeprecatedString, and repurposes it as a byte
string.
As the null state has already been removed, there are no other
particularly hairy blockers in repurposing this type as a byte string
(what it _really_ is).
This commit is auto-generated:
$ xs=$(ack -l \bDeprecatedString\b\|deprecated_string AK Userland \
Meta Ports Ladybird Tests Kernel)
$ perl -pie 's/\bDeprecatedString\b/ByteString/g;
s/deprecated_string/byte_string/g' $xs
$ clang-format --style=file -i \
$(git diff --name-only | grep \.cpp\|\.h)
$ gn format $(git ls-files '*.gn' '*.gni')
Previously, the Save action held a reference to the local variable for
the Save As action, which goes out of scope at the end of
`initialize_menubar()`. This meant that if you tried to Save a new
file, it would instead crash and yeet your work into the abyss.
The `view_frame_action` variable only exists for the duration of
`initialize_menubar()`, so calling it in `m_preview_window->on_close`
would crash. This fixes that by storing the action pointer inside
MainWidget. (And storing the `view_window_action` too because it felt
weird storing one and not the other.)
