Add options API

[originalfoo]

Fixes: #1376

Simple API for external mods to get TM:PE mod Options values. For example, if a mod needs to know which TMPE features are enabled, or get info on policy settings, icon theme, etc.

Vague example:

var mgr = OptionsManager.Instance;

if (mgr != null && mgr.OptionsAreSafeToQuery()) {
    if (mgr.TryGetOptionByName<bool>("turnOnRedEnabled", out bool turnOnRedEnabled) {
        if (turnOnRedEnabled) {
            // show some extra features in your traffic lights mod or whatever
        }
    }
}

Options are referenced by name, thus allowing us to alter names at later date whilst keeping API intact (a simple oldname -> newname lookup can be added on our side).

Options are accessed via reflection - while not super fast, it's reliable and allows us to easily handle possible future transition from option fields to properties, etc.

Thanks to @DaEgi01 for suggestion to use generics.

[krzychu124]

I've added some thoughts

[DaEgi01]

huh .. are you sure about that?

[originalfoo]

Yes. If the load method fails, the options will just have default values but TM:PE will still be fully operable.

The goal was to prevent other mods reading options either prior to options being set, or during save/load, or from main menu.

[DaEgi01]

But whats the point of playing with default options?
And what happens if I save the game with those defaults?
And what if another mod makes descisions based on that?

[DaEgi01]

If its fine for krzy its fine for me though.

[krzychu124]

I think we shouldn't try to save anything if failed to load, that won't overwrite old data, so in case of a bug in load code it could be loaded after applying hotfix - IIRC game is cloning mod data container so even if you not longer have a mod, data will be migrated to new saves.

[originalfoo]

Prior to this PR, what would the difference be?

If the data fails to load, the LoadData() method will still return false just like it previously did, which results in loadingSucceeded = false at the call site - that currently has no effect on whether SaveData() gets invoked later.

I've created an issue to track the need to prevent data save should data fail to load.

[krzychu124]

This PR is ok, you can merge :)

[originalfoo]

#1412

[originalfoo]

updated based on review feedback

[DaEgi01]

But whats the point of playing with default options?
And what happens if I save the game with those defaults?
And what if another mod makes descisions based on that?

[DaEgi01]

If its fine for krzy its fine for me though.