Don't try to parse JSON strings as date

[stertingen]

When parsing launch options from JSON, the JSON parser's default behavior is – for whatever reason – to parse slightly datetime-ish looking strings as date objects. This PR explicitly forbids this behavior when parsing launch options.

Partially fixes #1491, microsoft/vscode-cpptools#13241 and microsoft/vscode#238514.

[stertingen]

Never mind, this PR does not fix anything. It just modifies the string in a more subtle way.

[stertingen]

Diving deeper into this issue, I have realized that the arguments are parsed from JSON twice, and both times wrong.

1. Coming from a sample argument string: "2022-01-03T13:37:42+02:00"
2. String gets converted to Date by Microsoft.VisualStudio.Shared.VSCodeDebugProtocol (see Microsoft.VisualStudio.Shared.VSCodeDebugProtocol should not parse ISO 8601 compliant strings as date object VSDebugAdapterHost#34)
3. Date is serialized to string "2022-01-03T12:37:42+01:00" in

   MIEngine/src/OpenDebugAD7/AD7DebugSession.cs

   Line 1195 in 6c54916

   string launchJson = JsonConvert.SerializeObject(responder.Arguments.ConfigurationProperties);

4. Date is parsed again as Date in

   MIEngine/src/MICore/LaunchOptions.cs

   Line 1270 in 6c54916

   JObject parsedOptions = JObject.Parse(options);

5. Date is serialized to another string "01/03/2022 12:37:42" in

   MIEngine/src/MICore/JsonLaunchOptions.cs

   Line 756 in 6c54916

   baseOptions = parsedJObject.ToObject<Json.LaunchOptions.LaunchOptions>();

This PR fixes the second time the JSON document is parsed, prevents parsing as a date in step 4.

[gregg-miskelly]

Thanks for working so hard to fix this!

[gregg-miskelly]

Aside from that, looks good to me