Make -v|--version opt-in

We added an automatic version option in 0.49. We did this with good
intentions, but forgot that people might already use --version
as an option for a root command.

This commit makes -v|--version completely opt-in.

test/Spectre.Console.Cli.Tests/Expectations/Help/Hidden_Command_Options.Output.verified.txt

@@ -1,10 +1,9 @@
-USAGE:
+USAGE:
     myapp <FOO> [OPTIONS]
 
 ARGUMENTS:
     <FOO>    Dummy argument FOO
 
 OPTIONS:
-    -h, --help       Prints help information
-    -v, --version    Prints version information
-        --baz        Dummy option BAZ
+    -h, --help    Prints help information
+        --baz     Dummy option BAZ