Everywhere: Rename {Deprecated => Byte}String

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')

Userland/Libraries/LibVideo/Containers/Matroska/Document.h

@@ -7,8 +7,8 @@
 #pragma once
 
 #include <AK/ByteBuffer.h>
+#include <AK/ByteString.h>
 #include <AK/DeprecatedFlyString.h>
-#include <AK/DeprecatedString.h>
 #include <AK/HashMap.h>
 #include <AK/OwnPtr.h>
 #include <AK/Time.h>
@@ -18,7 +18,7 @@
 namespace Video::Matroska {
 
 struct EBMLHeader {
-    DeprecatedString doc_type;
+    ByteString doc_type;
     u32 doc_type_version;
 };
 
@@ -27,9 +27,9 @@ public:
     u64 timestamp_scale() const { return m_timestamp_scale; }
     void set_timestamp_scale(u64 timestamp_scale) { m_timestamp_scale = timestamp_scale; }
     Utf8View muxing_app() const { return Utf8View(m_muxing_app); }
-    void set_muxing_app(DeprecatedString muxing_app) { m_muxing_app = move(muxing_app); }
+    void set_muxing_app(ByteString muxing_app) { m_muxing_app = move(muxing_app); }
     Utf8View writing_app() const { return Utf8View(m_writing_app); }
-    void set_writing_app(DeprecatedString writing_app) { m_writing_app = move(writing_app); }
+    void set_writing_app(ByteString writing_app) { m_writing_app = move(writing_app); }
     Optional<double> duration_unscaled() const { return m_duration_unscaled; }
     void set_duration_unscaled(double duration) { m_duration_unscaled.emplace(duration); }
     Optional<Duration> duration() const
@@ -41,8 +41,8 @@ public:
 
 private:
     u64 m_timestamp_scale { 1'000'000 };
-    DeprecatedString m_muxing_app;
-    DeprecatedString m_writing_app;
+    ByteString m_muxing_app;
+    ByteString m_writing_app;
     Optional<double> m_duration_unscaled;
 };
 

Userland/Libraries/LibVideo/Containers/Matroska/Reader.cpp

@@ -980,13 +980,13 @@ DecoderErrorOr<void> SampleIterator::seek_to_cue_point(CuePoint const& cue_point
     return {};
 }
 
-ErrorOr<DeprecatedString> Streamer::read_string()
+ErrorOr<ByteString> Streamer::read_string()
 {
     auto string_length = TRY(read_variable_size_integer());
     if (remaining() < string_length)
         return Error::from_string_literal("String length extends past the end of the stream");
     auto string_data = data_as_chars();
-    auto string_value = DeprecatedString(string_data, strnlen(string_data, string_length));
+    auto string_value = ByteString(string_data, strnlen(string_data, string_length));
     TRY(read_raw_octets(string_length));
     return string_value;
 }

Userland/Libraries/LibVideo/Containers/Matroska/Reader.h

@@ -145,7 +145,7 @@ public:
     ErrorOr<u64> read_u64();
     ErrorOr<double> read_float();
 
-    ErrorOr<DeprecatedString> read_string();
+    ErrorOr<ByteString> read_string();
 
     ErrorOr<void> read_unknown_element();