manager: add proper support for options

ModpackUpdater/InstallOptionValueDictionary.cs

@@ -0,0 +1,28 @@
+namespace ModpackUpdater;
+
+public class InstallOptionValueDictionary : Dictionary<string, bool>
+{
+    public void SetOption(InstallOptionSet set, InstallOption option, bool value)
+    {
+        if (!set.Options.Contains(option))
+            throw new KeyNotFoundException("Options seems to be not a part of the option set.");
+        if (option.Default == value)
+            UnsetOption(set, option);
+        else
+            this[$"{set.Id}.{option.Id}"] = value;
+    }
+
+    public void UnsetOption(InstallOptionSet set, InstallOption option)
+    {
+        if (!set.Options.Contains(option))
+            throw new KeyNotFoundException("Options seems to be not a part of the option set.");
+        Remove($"{set.Id}.{option.Id}");
+    }
+
+    public bool GetOptionValue(InstallOptionSet set, InstallOption option)
+    {
+        if (TryGetValue($"{set.Id}.{option.Id}", out var value))
+            return value;
+        return option.Default;
+    }
+}