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/NoVersion.Output.verified.txt

@@ -0,0 +1,12 @@
+USAGE:
+    myapp <FOO> <BAR> <BAZ> <CORGI> [QUX] [OPTIONS]
+
+ARGUMENTS:
+    <FOO>
+    <BAR>
+    <BAZ>
+    <CORGI>
+    [QUX]
+
+OPTIONS:
+    -h, --help    Prints help information