docs(input): the V toggle, the harness switches, and the HUD line

Docs/controls.md documented the 0.1.0 bindings only, so the camera toggle added with
0.2.0 was undocumented for the player-facing set and the review switches were
undocumented everywhere. Adds the V row, a changes-since-0.1.0 note that first person
stays the default, and a table for -thirdperson / -walk / -qaselftest with the note
that the walking capture is driven per shot rather than by the switch.

The in-game HUD line gains 'V view' so the packaged build documents it too.

Game/GigLine/Source/GigLine/GigLineHUD.h

@@ -34,7 +34,7 @@ public:
 	 * in-game"). Keep in sync with Docs/controls.md.
 	 */
 	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Controls")
-	FString ControlsLine = TEXT("WASD move  \u00B7  Mouse look  \u00B7  Space jump  \u00B7  R reset  \u00B7  Esc pause");
+	FString ControlsLine = TEXT("WASD move  \u00B7  Mouse look  \u00B7  Space jump  \u00B7  V view  \u00B7  R reset  \u00B7  Esc pause");
 
 	/** Licence line, including where the licence can be read. */
 	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Attribution")