LibLine: Implement support for C-V<key>

This commit adds support for inserting in a "verbatim" mode where a
single uninterpreted key is appended to the buffer.
As this allows the user to input control characters, all control
characters except \n (^M) are rendered in their caret form, with
reverse video (SGR 7) applied to it.
To not break cursor movement, the concept of "masked" characters is
introduced to the StringMetrics interface, which can be mostly ignored
by the rest of the system.

It should be noted that unlike some other line editing libraries,
LibLine does _not_ render a hard tab as a tab, but rather as '^I',
which greatly simplifies cursor handling.

Libraries/LibLine/Editor.h

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2021, the SerenityOS developers.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -261,7 +262,7 @@ private:
         Title = 9,
     };
 
-    static VTState actual_rendered_string_length_step(StringMetrics&, size_t& length, u32, u32, VTState);
+    static VTState actual_rendered_string_length_step(StringMetrics&, size_t, StringMetrics::LineMetrics& current_line, u32, u32, VTState);
 
     enum LoopExitCode {
         Exit = 0,
@@ -456,6 +457,7 @@ private:
 
     enum class InputState {
         Free,
+        Verbatim,
         GotEscape,
         CSIExpectParameter,
         CSIExpectIntermediate,